Strip non-layout CSS to remain as style-agnostic as possible!

themes/base/css/atoms/MessageTimestamp.css

@@ -1,6 +1,4 @@
 .mx_MessageTimestamp {
-    color: #777;
     width: 75px;
-    font-size: 80%;
     display: inline-block;
 }

themes/base/css/molecules/MNoticeTile.css

@@ -1,3 +1,2 @@
 .mx_MNoticeTile {
-    color: #666;
 }

themes/base/css/molecules/MessageTile.css

@@ -1,5 +1,4 @@
 .mx_MessageTile {
-    border-bottom: 1px solid #eee;
 }
 
 .mx_MessageTile.sending {

themes/base/css/molecules/ProgressBar.css

@@ -1,12 +1,9 @@
 .mx_ProgressBar {
     height: 5px;
-    border-radius: 5px;
     border: 1px solid black;
-    margin-bottom: 10px;
 }
 
 .mx_ProgressBar_fill {
     height: 100%;
-    background-color: #666;
-    transition: width 0.1s ease;
+    background-color: #000;
 }

themes/base/css/molecules/RoomHeader.css

@@ -1,6 +1,4 @@
 .mx_RoomHeader {
-    background-color: #eee;
-    font-weight: bold;
     height: 1em;
     padding: 0px;
 }

themes/base/css/molecules/RoomTile.css

@@ -1,12 +1,9 @@
 .mx_RoomTile {
     height: 20px;
-    background-color: #ddd;
     margin-top: 1px;
     margin-bottom: 1px;
     padding: 5px;
     cursor: pointer;
-    border: 2px solid white;
-    transition: background-color 0.1s ease;
 }
 
 .mx_RoomTile.selected {
@@ -32,5 +29,4 @@
 }
 
 .mx_RoomTile:hover {
-    background-color: #ff8;
 }

themes/base/css/molecules/SenderProfile.css

@@ -1,6 +1,4 @@
 .mx_SenderProfile {
     display: inline-block;
     width: 150px;
-    color: #444;
-    font-size: 80%;
 }

themes/base/css/organisms/RoomView.css

@@ -25,14 +25,6 @@
 }
 
 .mx_RoomView .mx_RoomView_invitePrompt {
-    text-align: center;
-    background-color: #ddd;
-    border: 1px solid black;
-    width: 400px;
-    margin-left: auto;
-    margin-right: auto;
-    margin-top: 200px;
-    padding: 50px;
 }
 
 .mx_RoomView .mx_MemberList {

themes/base/css/templates/Login.css

@@ -1,12 +1,6 @@
 .mx_Login {
     width: 600px;
     height: 350px;
-    margin-left: auto;
-    margin-right: auto;
-    padding: 10px;
-    text-align: center;
-    background-color: #eee;
-    border: 1px solid black;
     position: relative;
 }