Minor bug fixes (#4172)

webapp/sass/components/_webrtc.scss

@@ -281,7 +281,7 @@
 
             video {
                 height: 100%;
-                width: auto;
+                width: 100%;
             }
         }
     }

webapp/sass/responsive/_mobile.scss

@@ -1,6 +1,10 @@
 @charset 'UTF-8';
 
 @media screen and (max-width: 768px) {
+    .filtered-user-list {
+        max-height: 65vh !important;
+    }
+
     .app__body {
         .edit-modal-body {