fix bad membership list horizontal scrolling

skins/base/css/molecules/RoomTile.css

@@ -31,7 +31,11 @@ limitations under the License.
     vertical-align: middle;
     width: 32px;
     height: 32px;
-    border-radius: 16px;    
+}
+
+.mx_RoomTile_avatar img {
+    border-radius: 16px;
+    background-color: #dbdbdb;
 }
 
 .mx_RoomTile_name {

skins/base/css/organisms/MemberList.css

@@ -15,26 +15,30 @@ limitations under the License.
 */
 
 .mx_MemberList {
-    width: 100%;
     height: 100%;
     margin-bottom: 100px;
+    padding: 8px;
 }
 
 .mx_MemberList_chevron {
     position: absolute;
     right: 20px;
-    margin-top: -5px;
+    margin-top: -13px;
 }
 
-.mx_MemberList_wrapper {
-    border: 1px solid #d8d8d8;
-    margin: 8px;
+.mx_MemberList_border {
+    border: 1px solid #d8d8d8;    
     overflow-y: scroll;
     height: auto;
     max-height: 75%;
     border-radius: 8px;
     padding: 20px 24px 14px 24px;
+}
+
+.mx_MemberList_wrapper {
+    display: table;
     table-layout: fixed;
+    width: 100%; 
 }
 
 .mx_MemberList h2 {