diff --git a/src/skins/vector/css/_common.scss b/src/skins/vector/css/_common.scss
index 9e2ac1f468..6a62385535 100644
--- a/src/skins/vector/css/_common.scss
+++ b/src/skins/vector/css/_common.scss
@@ -83,7 +83,6 @@ textarea {
 /* applied to side-panels and messagepanel when in RoomSettings */
 .mx_fadable {
     opacity: 1;
-    -webkit-transition: opacity 0.2s ease-in-out;
     -moz-transition: opacity 0.2s ease-in-out;
     -ms-transition: opacity 0.2s ease-in-out;
     -o-transition: opacity 0.2s ease-in-out;
@@ -128,14 +127,10 @@ textarea {
     width: 100%;
     height: 100%;
 
-    display: -webkit-box;
     display: -moz-box;
     display: -ms-flexbox;
-    display: -webkit-flex;
     display: flex;
-    -webkit-align-items: center;
     align-items: center;
-    -webkit-justify-content: center;
     justify-content: center;
 }
 
diff --git a/src/skins/vector/css/matrix-react-sdk/structures/_FilePanel.scss b/src/skins/vector/css/matrix-react-sdk/structures/_FilePanel.scss
index 2f4a00ad70..6c769a3bdd 100644
--- a/src/skins/vector/css/matrix-react-sdk/structures/_FilePanel.scss
+++ b/src/skins/vector/css/matrix-react-sdk/structures/_FilePanel.scss
@@ -15,13 +15,10 @@ limitations under the License.
 */
 
 .mx_FilePanel {
-    -webkit-box-ordinal-group: 2;
     -moz-box-ordinal-group: 2;
     -ms-flex-order: 2;
-    -webkit-order: 2;
     order: 2;
 
-    -webkit-flex: 1 1 0;
     flex: 1 1 0;
 
     width: 100%;
diff --git a/src/skins/vector/css/matrix-react-sdk/structures/_MatrixChat.scss b/src/skins/vector/css/matrix-react-sdk/structures/_MatrixChat.scss
index 5587a6093c..61eb017058 100644
--- a/src/skins/vector/css/matrix-react-sdk/structures/_MatrixChat.scss
+++ b/src/skins/vector/css/matrix-react-sdk/structures/_MatrixChat.scss
@@ -27,34 +27,27 @@ limitations under the License.
 }
 
 .mx_MatrixChat_wrapper {
-    display: -webkit-box;
     display: -moz-box;
     display: -ms-flexbox;
-    display: -webkit-flex;
     display: flex;
 
     flex-direction: column;
-    -webkit-flex-direction: column;
 
     width: 100%;
     height: 100%;
 }
 
 .mx_MatrixToolbar {
-    -webkit-box-ordinal-group: 1;
     -moz-box-ordinal-group: 1;
     -ms-flex-order: 1;
-    -webkit-order: 1;
     order: 1;
 
     height: 40px;
 }
 
 .mx_GuestWarningBar {
-    -webkit-box-ordinal-group: 1;
     -moz-box-ordinal-group: 1;
     -ms-flex-order: 1;
-    -webkit-order: 1;
     order: 1;
 
     height: 40px;
@@ -68,52 +61,40 @@ limitations under the License.
     width: 100%;
     height: 100%;
 
-    display: -webkit-box;
     display: -moz-box;
     display: -ms-flexbox;
-    display: -webkit-flex;
     display: flex;
 
-    -webkit-box-ordinal-group: 2;
     -moz-box-ordinal-group: 2;
     -ms-flex-order: 2;
-    -webkit-order: 2;
     order: 2;
 
-    -webkit-flex: 1;
     flex: 1;
 }
 
 .mx_MatrixChat .mx_LeftPanel {
-    -webkit-box-ordinal-group: 1;
     -moz-box-ordinal-group: 1;
     -ms-flex-order: 1;
-    -webkit-order: 1;
     order: 1;
 
     background-color: $secondary-accent-color;
 
-    -webkit-flex: 0 0 235px;
     flex: 0 0 235px;
 }
 
 .mx_MatrixChat .mx_LeftPanel.collapsed {
-    -webkit-flex: 0 0 60px;
     flex: 0 0 60px;
 }
 
 .mx_MatrixChat .mx_MatrixChat_middlePanel {
-    -webkit-box-ordinal-group: 2;
     -moz-box-ordinal-group: 2;
     -ms-flex-order: 2;
-    -webkit-order: 2;
     order: 2;
 
     padding-left: 20px;
     padding-right: 22px;
     background-color: $primary-bg-color;
 
-    -webkit-flex: 1;
     flex: 1;
 
     /* Experimental fix for https://github.com/vector-im/vector-web/issues/947
@@ -132,25 +113,19 @@ limitations under the License.
      * point, but instead we fudge it and make the middlePanel
      * flex itself.
      */
-    display: -webkit-box;
     display: -moz-box;
     display: -ms-flexbox;
-    display: -webkit-flex;
     display: flex;
 }
 
 .mx_MatrixChat .mx_RightPanel {
-    -webkit-box-ordinal-group: 3;
     -moz-box-ordinal-group: 3;
     -ms-flex-order: 3;
-    -webkit-order: 3;
     order: 3;
 
-    -webkit-flex: 0 0 235px;
     flex: 0 0 235px;
 }
 
 .mx_MatrixChat .mx_RightPanel.collapsed {
-    -webkit-flex: 0 0 122px;
     flex: 0 0 122px;
 }
diff --git a/src/skins/vector/css/matrix-react-sdk/structures/_NotificationPanel.scss b/src/skins/vector/css/matrix-react-sdk/structures/_NotificationPanel.scss
index 06dd92f315..ed81849776 100644
--- a/src/skins/vector/css/matrix-react-sdk/structures/_NotificationPanel.scss
+++ b/src/skins/vector/css/matrix-react-sdk/structures/_NotificationPanel.scss
@@ -15,13 +15,10 @@ limitations under the License.
 */
 
 .mx_NotificationPanel {
-    -webkit-box-ordinal-group: 2;
     -moz-box-ordinal-group: 2;
     -ms-flex-order: 2;
-    -webkit-order: 2;
     order: 2;
 
-    -webkit-flex: 1 1 0;
     flex: 1 1 0;
 
     width: 100%;
diff --git a/src/skins/vector/css/matrix-react-sdk/structures/_RoomStatusBar.scss b/src/skins/vector/css/matrix-react-sdk/structures/_RoomStatusBar.scss
index d0ac5a600c..5daac88fc4 100644
--- a/src/skins/vector/css/matrix-react-sdk/structures/_RoomStatusBar.scss
+++ b/src/skins/vector/css/matrix-react-sdk/structures/_RoomStatusBar.scss
@@ -123,18 +123,15 @@ limitations under the License.
 
 .mx_RoomStatusBar_tabCompleteWrapper {
     display: flex;
-    display: -webkit-flex;
     height: 26px;
 }
 
 .mx_RoomStatusBar_tabCompleteWrapper .mx_TabCompleteBar {
     flex: 1 1 auto;
-    -webkit-flex: 1 1 auto;
 }
 
 .mx_RoomStatusBar_tabCompleteEol {
     flex: 0 0 auto;
-    -webkit-flex: 0 0 auto;
     color: $accent-color;
 }
 
diff --git a/src/skins/vector/css/matrix-react-sdk/structures/_RoomView.scss b/src/skins/vector/css/matrix-react-sdk/structures/_RoomView.scss
index 182d690c5e..dc668236b8 100644
--- a/src/skins/vector/css/matrix-react-sdk/structures/_RoomView.scss
+++ b/src/skins/vector/css/matrix-react-sdk/structures/_RoomView.scss
@@ -18,25 +18,19 @@ limitations under the License.
     word-wrap: break-word;
     position: relative;
 
-    display: -webkit-box;
     display: -moz-box;
     display: -ms-flexbox;
-    display: -webkit-flex;
     display: flex;
     width: 100%;
 
     flex-direction: column;
-    -webkit-flex-direction: column;
 }
 
 .mx_RoomView .mx_RoomHeader {
-    -webkit-box-ordinal-group: 1;
     -moz-box-ordinal-group: 1;
     -ms-flex-order: 1;
-    -webkit-order: 1;
     order: 1;
 
-    -webkit-flex: 0 0 70px;
     flex: 0 0 70px;
 }
 
@@ -53,8 +47,6 @@ limitations under the License.
     padding-right: 12px;
     margin-left: -12px;
 
-    -webkit-border-top-left-radius: 10px;
-    -webkit-border-top-right-radius: 10px;
     -moz-border-radius-topleft: 10px;
     -moz-border-radius-topright: 10px;
     border-top-left-radius: 10px;
@@ -77,10 +69,8 @@ limitations under the License.
 }
 
 .mx_RoomView_auxPanel {
-    -webkit-box-ordinal-group: 2;
     -moz-box-ordinal-group: 2;
     -ms-flex-order: 2;
-    -webkit-order: 2;
     order: 2;
 
     min-width: 0px;
@@ -91,26 +81,20 @@ limitations under the License.
     overflow: auto;
     border-bottom: 1px solid $primary-hairline-color;
 
-    -webkit-flex: 0 0 auto;
     flex: 0 0 auto;
 }
 
 .mx_RoomView_topUnreadMessagesBar {
-    -webkit-box-ordinal-group: 3;
     -moz-box-ordinal-group: 3;
     -ms-flex-order: 3;
-    -webkit-order: 3;
     order: 3;
 }
 
 .mx_RoomView_messagePanel {
-    -webkit-box-ordinal-group: 4;
     -moz-box-ordinal-group: 4;
     -ms-flex-order: 4;
-    -webkit-order: 4;
     order: 4;
 
-    -webkit-flex: 1 1 0;
     flex: 1 1 0;
 
     width: 100%;
@@ -124,22 +108,17 @@ limitations under the License.
 
     min-height: 100%;
 
-    display: -webkit-box;
     display: -moz-box;
     display: -ms-flexbox;
-    display: -webkit-flex;
     display: flex;
 
     flex-direction: column;
-    -webkit-flex-direction: column;
 
     justify-content: flex-end;
-    -webkit-justify-content: flex-end;
 }
 
 .mx_RoomView_searchResultsPanel .mx_RoomView_messageListWrapper {
     justify-content: flex-start;
-    -webkit-justify-content: flex-start;
 }
 
 .mx_RoomView_MessageList {
@@ -162,10 +141,8 @@ limitations under the License.
 }
 
 .mx_RoomView_invitePrompt {
-    -webkit-box-ordinal-group: 2;
     -moz-box-ordinal-group: 2;
     -ms-flex-order: 2;
-    -webkit-order: 2;
     order: 2;
 
     min-width: 0px;
@@ -193,14 +170,11 @@ hr.mx_RoomView_myReadMarker {
 }
 
 .mx_RoomView_statusArea {
-    -webkit-box-ordinal-group: 5;
     -moz-box-ordinal-group: 5;
     -ms-flex-order: 5;
-    -webkit-order: 5;
     order: 5;
 
     width: 100%;
-    -webkit-flex: 0 0 auto;
     flex: 0 0 auto;
 }
 
@@ -257,14 +231,11 @@ hr.mx_RoomView_myReadMarker {
 }
 
 .mx_RoomView .mx_MessageComposer {
-    -webkit-box-ordinal-group: 6;
     -moz-box-ordinal-group: 6;
     -ms-flex-order: 6;
-    -webkit-order: 6;
     order: 6;
 
     width: 100%;
-    -webkit-flex: 0 0 auto;
     flex: 0 0 auto;
     margin-right: 2px;
 }
diff --git a/src/skins/vector/css/matrix-react-sdk/structures/_SearchBox.scss b/src/skins/vector/css/matrix-react-sdk/structures/_SearchBox.scss
index 0b5362593b..bd335f6023 100644
--- a/src/skins/vector/css/matrix-react-sdk/structures/_SearchBox.scss
+++ b/src/skins/vector/css/matrix-react-sdk/structures/_SearchBox.scss
@@ -22,7 +22,6 @@ limitations under the License.
     padding-bottom: 22px;
 
     display: flex;
-    display: -webkit-flex;
 }
 
 .mx_SearchBox_searchButton {
@@ -38,7 +37,6 @@ limitations under the License.
 
 .mx_SearchBox_search {
     flex: 1 1 auto;
-    -webkit-flex: 1 1 auto;
     width: 0px;
     font-family: 'Open Sans', Arial, Helvetica, Sans-Serif;
     font-size: 12px;
diff --git a/src/skins/vector/css/matrix-react-sdk/structures/_UserSettings.scss b/src/skins/vector/css/matrix-react-sdk/structures/_UserSettings.scss
index 1379063dc9..2c62a4eceb 100644
--- a/src/skins/vector/css/matrix-react-sdk/structures/_UserSettings.scss
+++ b/src/skins/vector/css/matrix-react-sdk/structures/_UserSettings.scss
@@ -20,34 +20,25 @@ limitations under the License.
     margin-left: auto;
     margin-right: auto;
 
-    display: -webkit-box;
     display: -moz-box;
     display: -ms-flexbox;
-    display: -webkit-flex;
     display: flex;
     flex-direction: column;
-    -webkit-flex-direction: column;
 }
 
 .mx_UserSettings .mx_RoomHeader {
-    -webkit-box-ordinal-group: 1;
     -moz-box-ordinal-group: 1;
     -ms-flex-order: 1;
-    -webkit-order: 1;
     order: 1;
 
-    -webkit-flex: 0 0 70px;
     flex: 0 0 70px;
 }
 
 .mx_UserSettings_body {
-    -webkit-box-ordinal-group: 2;
     -moz-box-ordinal-group: 2;
     -ms-flex-order: 2;
-    -webkit-order: 2;
     order: 2;
 
-    -webkit-flex: 1 1 0;
     flex: 1 1 0;
 
     margin-top: -20px;
diff --git a/src/skins/vector/css/matrix-react-sdk/structures/login/_Login.scss b/src/skins/vector/css/matrix-react-sdk/structures/login/_Login.scss
index 75dc71806e..332f313f33 100644
--- a/src/skins/vector/css/matrix-react-sdk/structures/login/_Login.scss
+++ b/src/skins/vector/css/matrix-react-sdk/structures/login/_Login.scss
@@ -18,14 +18,10 @@ limitations under the License.
     width: 100%;
     height: 100%;
 
-    display: -webkit-box;
     display: -moz-box;
     display: -ms-flexbox;
-    display: -webkit-flex;
     display: flex;
-    -webkit-align-items: center;
     align-items: center;
-    -webkit-justify-content: center;
     justify-content: center;
 
     overflow: auto;
diff --git a/src/skins/vector/css/matrix-react-sdk/views/elements/_DirectorySearchBox.scss b/src/skins/vector/css/matrix-react-sdk/views/elements/_DirectorySearchBox.scss
index 66063733a6..8824c65901 100644
--- a/src/skins/vector/css/matrix-react-sdk/views/elements/_DirectorySearchBox.scss
+++ b/src/skins/vector/css/matrix-react-sdk/views/elements/_DirectorySearchBox.scss
@@ -22,14 +22,12 @@ limitations under the License.
 
 .mx_DirectorySearchBox_container {
     display: flex;
-    display: -webkit-flex;
     padding-left: 9px;
     padding-right: 9px;
 }
 
 .mx_DirectorySearchBox_input {
     flex-grow: 1;
-    -webkit-flex-grow: 1;
     border: 0;
     padding: 0;
     font-weight: 300;
diff --git a/src/skins/vector/css/matrix-react-sdk/views/rooms/_LinkPreviewWidget.scss b/src/skins/vector/css/matrix-react-sdk/views/rooms/_LinkPreviewWidget.scss
index 2e2d9f8046..0e91154164 100644
--- a/src/skins/vector/css/matrix-react-sdk/views/rooms/_LinkPreviewWidget.scss
+++ b/src/skins/vector/css/matrix-react-sdk/views/rooms/_LinkPreviewWidget.scss
@@ -18,14 +18,12 @@ limitations under the License.
     margin-top: 15px;
     margin-right: 15px;
     margin-bottom: 15px;
-    display: -webkit-flex;
     display: flex;
     border-left: 4px solid #ddd;
     color: #888;
 }
 
 .mx_LinkPreviewWidget_image {
-    -webkit-flex: 0 0 100px;
     flex: 0 0 100px;
     margin-left: 15px;
     text-align: center;
@@ -34,7 +32,6 @@ limitations under the License.
 
 .mx_LinkPreviewWidget_caption {
     margin-left: 15px;
-    -webkit-flex: 1 1 auto;
     flex: 1 1 auto;
 }
 
@@ -56,7 +53,6 @@ limitations under the License.
 .mx_LinkPreviewWidget_cancel {
     visibility: hidden;
     cursor: pointer;
-    -webkit-flex: 0 0 40px;
     flex: 0 0 40px;
 }
 
diff --git a/src/skins/vector/css/matrix-react-sdk/views/rooms/_MemberList.scss b/src/skins/vector/css/matrix-react-sdk/views/rooms/_MemberList.scss
index 8a6f117240..403de7f945 100644
--- a/src/skins/vector/css/matrix-react-sdk/views/rooms/_MemberList.scss
+++ b/src/skins/vector/css/matrix-react-sdk/views/rooms/_MemberList.scss
@@ -20,22 +20,17 @@ limitations under the License.
     margin-top: 12px;
     margin-right: 20px;
 
-    -webkit-flex: 1;
     flex: 1;
 
-    display: -webkit-box;
     display: -moz-box;
     display: -ms-flexbox;
-    display: -webkit-flex;
     display: flex;
 
     flex-direction: column;
-    -webkit-flex-direction: column;
 }
 
 .mx_MemberList .mx_Spinner {
     flex: 0;
-    -webkit-flex: 0;
 }
 
 .mx_MemberList_chevron {
@@ -48,7 +43,6 @@ limitations under the License.
     overflow-y: auto;
 
     order: 1;
-    -webkit-flex: 1 1 0;
     flex: 1 1 0px;
 }
 
@@ -80,7 +74,6 @@ limitations under the License.
 .mx_MemberList_joined {
     order: 2;
     flex: 1 0 0;
-    -webkit-flex: 1 0 0;
 
     overflow-y: auto;
 }
@@ -89,7 +82,6 @@ limitations under the License.
 .mx_MemberList_invited {
     order: 3;
     flex: 0 0 100px;
-    -webkit-flex: 0 0 100px;
     overflow-y: auto;
 }
 */
diff --git a/src/skins/vector/css/matrix-react-sdk/views/rooms/_MessageComposer.scss b/src/skins/vector/css/matrix-react-sdk/views/rooms/_MessageComposer.scss
index e5ffd22064..a4549c0f8e 100644
--- a/src/skins/vector/css/matrix-react-sdk/views/rooms/_MessageComposer.scss
+++ b/src/skins/vector/css/matrix-react-sdk/views/rooms/_MessageComposer.scss
@@ -105,7 +105,6 @@ limitations under the License.
     border: 0px;
     resize: none;
     outline: none;
-    -webkit-box-shadow: none;
     -moz-box-shadow: none;
     box-shadow: none;
     color: $primary-fg-color;
diff --git a/src/skins/vector/css/matrix-react-sdk/views/rooms/_RoomHeader.scss b/src/skins/vector/css/matrix-react-sdk/views/rooms/_RoomHeader.scss
index a26f12ee69..73327ea6a0 100644
--- a/src/skins/vector/css/matrix-react-sdk/views/rooms/_RoomHeader.scss
+++ b/src/skins/vector/css/matrix-react-sdk/views/rooms/_RoomHeader.scss
@@ -25,36 +25,28 @@ limitations under the License.
     margin: auto;
     height: 70px;
 
-    -webkit-align-items: center;
     align-items: center;
 
-    display: -webkit-box;
     display: -moz-box;
     display: -ms-flexbox;
-    display: -webkit-flex;
     display: flex;
 }
 
 .mx_RoomHeader_leftRow {
     margin-left: -2px;
 
-    -webkit-box-ordinal-group: 1;
     -moz-box-ordinal-group: 1;
     -ms-flex-order: 1;
-    -webkit-order: 1;
     order: 1;
 
-    -webkit-flex: 1;
     flex: 1;
 }
 
 .mx_RoomHeader_spinner {
     height: 36px;
 
-    -webkit-box-ordinal-group: 2;
     -moz-box-ordinal-group: 2;
     -ms-flex-order: 2;
-    -webkit-order: 2;
     order: 2;
 
     padding-left: 12px;
@@ -71,16 +63,13 @@ limitations under the License.
     margin-top: -2px;
     text-align: center;
 
-    -webkit-box-ordinal-group: 2;
     -moz-box-ordinal-group: 2;
     -ms-flex-order: 2;
-    -webkit-order: 2;
     order: 2;
 
     cursor: pointer;
 
 /*
-    -webkit-flex: 0 0 90px;
     flex: 0 0 90px;
 */
     padding-left: 12px;
@@ -88,10 +77,8 @@ limitations under the License.
 }
 
 .mx_RoomHeader_cancelButton {
-    -webkit-box-ordinal-group: 2;
     -moz-box-ordinal-group: 2;
     -ms-flex-order: 2;
-    -webkit-order: 2;
     order: 2;
 
     cursor: pointer;
@@ -105,10 +92,8 @@ limitations under the License.
     background-color: $primary-bg-color;
     display: flex;
     align-items: center;
-    -webkit-box-ordinal-group: 3;
     -moz-box-ordinal-group: 3;
     -ms-flex-order: 3;
-    -webkit-order: 3;
     order: 3;
 }
 
diff --git a/src/skins/vector/css/matrix-react-sdk/views/rooms/_RoomPreviewBar.scss b/src/skins/vector/css/matrix-react-sdk/views/rooms/_RoomPreviewBar.scss
index 6b71f96d2e..0d030ad774 100644
--- a/src/skins/vector/css/matrix-react-sdk/views/rooms/_RoomPreviewBar.scss
+++ b/src/skins/vector/css/matrix-react-sdk/views/rooms/_RoomPreviewBar.scss
@@ -18,19 +18,14 @@ limitations under the License.
     text-align: center;
     height: 176px;
 
-    -webkit-align-items: center;
     align-items: center;
 
     flex-direction: column;
-    -webkit-flex-direction: column;
 
     justify-content: center;
-    -webkit-justify-content: center;
 
-    display: -webkit-box;
     display: -moz-box;
     display: -ms-flexbox;
-    display: -webkit-flex;
     display: flex;
 }
 
@@ -56,9 +51,7 @@ limitations under the License.
 }
 
 .mx_RoomPreviewBar_warning {
-    display: -webkit-flex;
     display: flex;
-    -webkit-align-items: center;
     align-items: center;
     padding: 8px;
 }
diff --git a/src/skins/vector/css/matrix-react-sdk/views/rooms/_SearchableEntityList.scss b/src/skins/vector/css/matrix-react-sdk/views/rooms/_SearchableEntityList.scss
index 9a24868d14..b404da0206 100644
--- a/src/skins/vector/css/matrix-react-sdk/views/rooms/_SearchableEntityList.scss
+++ b/src/skins/vector/css/matrix-react-sdk/views/rooms/_SearchableEntityList.scss
@@ -16,10 +16,8 @@ limitations under the License.
 
 .mx_SearchableEntityList {
     display: flex;
-    display: -webkit-flex;
 
     flex-direction: column;
-    -webkit-flex-direction: column;
 }
 
 .mx_SearchableEntityList_query {
@@ -49,7 +47,6 @@ limitations under the License.
 
 .mx_SearchableEntityList_listWrapper {
     flex: 1;
-    -webkit-flex: 1;
 
     overflow-y: auto;
 }
@@ -67,7 +64,6 @@ limitations under the License.
 .mx_SearchableEntityList_hrWrapper {
     width: 100%;
     flex: 0 0 auto;
-    -webkit-flex: 0 0 auto;
 }
 
 .mx_SearchableEntityList hr {
diff --git a/src/skins/vector/css/matrix-react-sdk/views/voip/_IncomingCallbox.scss b/src/skins/vector/css/matrix-react-sdk/views/voip/_IncomingCallbox.scss
index 97a82a03e8..d45c4a5816 100644
--- a/src/skins/vector/css/matrix-react-sdk/views/voip/_IncomingCallbox.scss
+++ b/src/skins/vector/css/matrix-react-sdk/views/voip/_IncomingCallbox.scss
@@ -41,14 +41,12 @@ limitations under the License.
 
 .mx_IncomingCallBox_buttons {
     display: flex;
-    display: -webkit-flex;
 }
 
 .mx_IncomingCallBox_buttons_cell {
     vertical-align: middle;
     padding: 6px;
     flex: 1;
-    -webkit-flex: 1;
 }
 
 .mx_IncomingCallBox_buttons_decline,
diff --git a/src/skins/vector/css/vector-web/structures/_LeftPanel.scss b/src/skins/vector/css/vector-web/structures/_LeftPanel.scss
index 4e3281716e..36a1e2988d 100644
--- a/src/skins/vector/css/vector-web/structures/_LeftPanel.scss
+++ b/src/skins/vector/css/vector-web/structures/_LeftPanel.scss
@@ -17,13 +17,10 @@ limitations under the License.
 .mx_LeftPanel {
     position: relative;
 
-    display: -webkit-box;
     display: -moz-box;
     display: -ms-flexbox;
-    display: -webkit-flex;
     display: flex;
     flex-direction: column;
-    -webkit-flex-direction: column;
 }
 
 .mx_LeftPanel_hideButton {
@@ -39,13 +36,10 @@ limitations under the License.
 }
 
 .mx_LeftPanel .mx_RoomList_scrollbar {
-    -webkit-box-ordinal-group: 1;
     -moz-box-ordinal-group: 1;
     -ms-flex-order: 1;
-    -webkit-order: 1;
     order: 1;
 
-    -webkit-flex: 1 1 0;
     flex: 1 1 0;
 
     overflow-y: auto;
@@ -57,16 +51,13 @@ limitations under the License.
 }
 
 .mx_LeftPanel .mx_BottomLeftMenu {
-    -webkit-box-ordinal-group: 3;
     -moz-box-ordinal-group: 3;
     -ms-flex-order: 3;
-    -webkit-order: 3;
     order: 3;
 
     border-top: 1px solid rgba(118, 207, 166, 0.2);
     margin-left: 16px; /* gutter */
     margin-right: 16px; /* gutter */
-    -webkit-flex: 0 0 60px;
     flex: 0 0 60px;
     z-index: 1;
 }
diff --git a/src/skins/vector/css/vector-web/structures/_RightPanel.scss b/src/skins/vector/css/vector-web/structures/_RightPanel.scss
index b9dbf1cd79..000d36b31b 100644
--- a/src/skins/vector/css/vector-web/structures/_RightPanel.scss
+++ b/src/skins/vector/css/vector-web/structures/_RightPanel.scss
@@ -17,26 +17,20 @@ limitations under the License.
 .mx_RightPanel {
     position: relative;
 
-    display: -webkit-box;
     display: -moz-box;
     display: -ms-flexbox;
-    display: -webkit-flex;
     display: flex;
     flex-direction: column;
-    -webkit-flex-direction: column;
 }
 
 .mx_RightPanel_header {
-    -webkit-box-ordinal-group: 1;
     -moz-box-ordinal-group: 1;
     -ms-flex-order: 1;
-    -webkit-order: 1;
     order: 1;
 
     border-bottom: 1px solid $primary-hairline-color;
     margin-right: 20px;
 
-    -webkit-flex: 0 0 70px;
     flex: 0 0 70px;
 }
 
@@ -81,26 +75,20 @@ limitations under the License.
 .mx_RightPanel .mx_MemberList,
 .mx_RightPanel .mx_MemberInfo,
 .mx_RightPanel_blank {
-    -webkit-box-ordinal-group: 2;
     -moz-box-ordinal-group: 2;
     -ms-flex-order: 2;
-    -webkit-order: 2;
     order: 2;
     flex: 1 1 0;
-    -webkit-flex: 1 1 0;
 }
 
 .mx_RightPanel_footer {
-    -webkit-box-ordinal-group: 3;
     -moz-box-ordinal-group: 3;
     -ms-flex-order: 3;
-    -webkit-order: 3;
     order: 3;
 
     border-top: 1px solid $primary-hairline-color;
     margin-right: 20px;
 
-    -webkit-flex: 0 0 60px;
     flex: 0 0 60px;
 }
 
diff --git a/src/skins/vector/css/vector-web/structures/_RoomDirectory.scss b/src/skins/vector/css/vector-web/structures/_RoomDirectory.scss
index 3dd885ba47..c80a8d8fc5 100644
--- a/src/skins/vector/css/vector-web/structures/_RoomDirectory.scss
+++ b/src/skins/vector/css/vector-web/structures/_RoomDirectory.scss
@@ -22,33 +22,25 @@ limitations under the License.
     margin-bottom: 12px;
     color: $primary-fg-color;
 
-    display: -webkit-box;
     display: -moz-box;
     display: -ms-flexbox;
-    display: -webkit-flex;
     display: flex;
 
     flex-direction: column;
-    -webkit-flex-direction: column;
 }
 
 .mx_RoomDirectory_list {
-    -webkit-flex: 1;
     flex: 1;
 
-    display: -webkit-box;
     display: -moz-box;
     display: -ms-flexbox;
-    display: -webkit-flex;
     display: flex;
 
     flex-direction: column;
-    -webkit-flex-direction: column;
 }
 
 .mx_RoomDirectory_list .mx_RoomView_messageListWrapper {
     justify-content: flex-start;
-    -webkit-justify-content: flex-start;
 }
 
 .mx_RoomDirectory_listheader {
@@ -72,7 +64,6 @@ limitations under the License.
 
 .mx_RoomDirectory_tableWrapper {
     overflow-y: auto;
-    -webkit-flex: 1 1 0;
     flex: 1 1 0;
 }
 
diff --git a/src/skins/vector/css/vector-web/views/elements/_ImageView.scss b/src/skins/vector/css/vector-web/views/elements/_ImageView.scss
index d66d9c7dbd..d31a9d2785 100644
--- a/src/skins/vector/css/vector-web/views/elements/_ImageView.scss
+++ b/src/skins/vector/css/vector-web/views/elements/_ImageView.scss
@@ -19,18 +19,14 @@ limitations under the License.
  */
 
 .mx_ImageView {
-    display: -webkit-flex;
     display: flex;
     width: 100%;
     height: 100%;
-    -webkit-align-items: center;
     align-items: center;
 }
 
 .mx_ImageView_lhs {
-    -webkit-box-ordinal-group: 1;
     order: 1;
-    -webkit-flex: 1;
     flex: 1 1 10%;
     min-width: 60px;
     /*
@@ -40,18 +36,13 @@ limitations under the License.
 }
 
 .mx_ImageView_content {
-    -webkit-box-ordinal-group: 2;
     order: 2;
     /* min-width hack needed for FF */
     min-width: 0px;
     height: 90%;
-    -webkit-flex: 15;
     flex: 15 15 0;
 
-    display: -webkit-flex;
     display: flex;
-    -webkit-align-items: center;
-    -webkit-justify-content: center;
     align-items: center;
     justify-content: center;
 }
@@ -78,11 +69,8 @@ limitations under the License.
 .mx_ImageView_label {
     text-align: left;
     display: flex;
-    display: -webkit-flex;
     justify-content: center;
-    -webkit-justify-content: center;
     flex-direction: column;
-    -webkit-flex-direction: column;
     padding-left: 30px;
     padding-right: 30px;
     min-height: 100%;
@@ -141,9 +129,7 @@ limitations under the License.
 }
 
 .mx_ImageView_rhs {
-    -webkit-box-ordinal-group: 3;
     order: 3;
-    -webkit-flex: 1;
     flex: 1 1 10%;
     min-width: 300px;
     /*
diff --git a/src/skins/vector/css/vector-web/views/elements/_Spinner.scss b/src/skins/vector/css/vector-web/views/elements/_Spinner.scss
index 3831cc4c1c..aea5737918 100644
--- a/src/skins/vector/css/vector-web/views/elements/_Spinner.scss
+++ b/src/skins/vector/css/vector-web/views/elements/_Spinner.scss
@@ -15,16 +15,12 @@ limitations under the License.
 */
 
 .mx_Spinner {
-    display: -webkit-flex;
     display: flex;
-    -webkit-align-items: center;
-    -webkit-justify-content: center;
     align-items: center;
     justify-content: center;
     width: 100%;
     height: 100%;
     flex: 1;
-    -webkit-flex: 1;
 }
 
 .mx_MatrixChat_middlePanel .mx_Spinner {
diff --git a/src/skins/vector/css/vector-web/views/globals/_GuestWarningBar.scss b/src/skins/vector/css/vector-web/views/globals/_GuestWarningBar.scss
index e8b5aebbb8..2141f3a8ad 100644
--- a/src/skins/vector/css/vector-web/views/globals/_GuestWarningBar.scss
+++ b/src/skins/vector/css/vector-web/views/globals/_GuestWarningBar.scss
@@ -18,12 +18,9 @@ limitations under the License.
     background-color: $accent-color;
     color: $accent-fg-color;
 
-    display: -webkit-box;
     display: -moz-box;
     display: -ms-flexbox;
-    display: -webkit-flex;
     display: flex;
-    -webkit-align-items: center;
     align-items: center;
 }
 
diff --git a/src/skins/vector/css/vector-web/views/globals/_MatrixToolbar.scss b/src/skins/vector/css/vector-web/views/globals/_MatrixToolbar.scss
index 9bd70bb944..9e21bcb1f2 100644
--- a/src/skins/vector/css/vector-web/views/globals/_MatrixToolbar.scss
+++ b/src/skins/vector/css/vector-web/views/globals/_MatrixToolbar.scss
@@ -18,12 +18,9 @@ limitations under the License.
     background-color: $accent-color;
     color: $accent-fg-color;
 
-    display: -webkit-box;
     display: -moz-box;
     display: -ms-flexbox;
-    display: -webkit-flex;
     display: flex;
-    -webkit-align-items: center;
     align-items: center;
 }
 
@@ -34,7 +31,6 @@ limitations under the License.
 }
 
 .mx_MatrixToolbar_content {
-    -webkit-flex: 1;
     flex: 1;
 }
 
diff --git a/src/skins/vector/css/vector-web/views/rooms/_SearchBar.scss b/src/skins/vector/css/vector-web/views/rooms/_SearchBar.scss
index 5d1953220a..079ea16c68 100644
--- a/src/skins/vector/css/vector-web/views/rooms/_SearchBar.scss
+++ b/src/skins/vector/css/vector-web/views/rooms/_SearchBar.scss
@@ -18,9 +18,7 @@ limitations under the License.
     padding-top: 5px;
     padding-bottom: 5px;
     display: flex;
-    display: -webkit-flex;
     align-items: center;
-    -webkit-align-items: center;
 }
 
 .mx_SearchBar_input {
@@ -32,7 +30,6 @@ limitations under the License.
     padding-left: 11px;
     width: auto;
     flex: 1 1 0;
-    -webkit-flex: 1 1 0;
 }
 
 .mx_SearchBar_searchButton {