diff --git a/src/skins/vector/css/matrix-react-sdk/views/rooms/Autocomplete.css b/src/skins/vector/css/matrix-react-sdk/views/rooms/Autocomplete.css
new file mode 100644
index 0000000000..40a08ee2d3
--- /dev/null
+++ b/src/skins/vector/css/matrix-react-sdk/views/rooms/Autocomplete.css
@@ -0,0 +1,67 @@
+.mx_Autocomplete {
+    position: absolute;
+    bottom: 0;
+    z-index: 1000;
+    width: 100%;
+    border: 1px solid #e5e5e5;
+    background: rgba(255, 255, 255, 0.9);
+    border-bottom: none;
+    border-radius: 4px 4px 0 0;
+    max-height: 50vh;
+    overflow: auto
+}
+
+.mx_Autocomplete_ProviderSection {
+    padding: 12px;
+    border-bottom: 1px solid #e5e5e5;
+}
+
+.mx_Autocomplete_ProviderSection * {
+    padding: 2px;
+    border-radius: 4px;
+}
+
+.mx_Autocomplete_Completion {
+    user-select: none;
+    cursor: pointer;
+    transition: 0.3s all ease;
+    display: flex;
+    align-items: center;
+}
+
+.mx_Autocomplete_Completion.selected * {
+    transition: 0.3s all ease;
+}
+
+.mx_Autocomplete_Completion.selected {
+    background: #76cfa6;
+    color: white;
+    outline: none;
+}
+
+.mx_Autocomplete_Completion.selected * {
+    color: white !important;
+}
+
+.mx_Autocomplete_provider_name {
+    color: #76cfa6;
+    font-weight: 600;
+}
+
+.autocomplete-enter {
+    opacity: 0.01;
+}
+
+.autocomplete-enter.autocomplete-enter-active {
+    opacity: 1;
+    transition: opacity 300ms ease-in;
+}
+
+.autocomplete-leave {
+    opacity: 1;
+}
+
+.autocomplete-leave.autocomplete-leave-active {
+    opacity: 0.01;
+    transition: opacity 300ms ease-in;
+}
diff --git a/src/skins/vector/css/matrix-react-sdk/views/rooms/MessageComposer.css b/src/skins/vector/css/matrix-react-sdk/views/rooms/MessageComposer.css
index 8cced52c77..9242af89a9 100644
--- a/src/skins/vector/css/matrix-react-sdk/views/rooms/MessageComposer.css
+++ b/src/skins/vector/css/matrix-react-sdk/views/rooms/MessageComposer.css
@@ -21,6 +21,11 @@ limitations under the License.
     border-top: 1px solid #e5e5e5;
 }
 
+.mx_MessageComposer_autocomplete_wrapper {
+    position: relative;
+    height: 0;
+}
+
 .mx_MessageComposer_row {
     display: flex;
     flex-direction: row;