cleanup, fix some things, try to disable scrollbars on mobile

src/components/chat/chat.scss

@@ -133,18 +133,9 @@
     .chat-view-heading {
       box-sizing: border-box;
       position: static;
-      z-index: 9999;
       top: 0;
       margin-top: 0;
       border-radius: 0;
-
-      /* This practically overlays the panel heading color over panel background
-       * color. This is needed because we allow transparent panel background and
-       * it doesn't work well in this "disjointed panel header" case
-       */
-      background:
-        linear-gradient(to top, var(--panel), var(--panel)),
-        linear-gradient(to top, var(--bg), var(--bg));
       height: 50px;
     }
 

src/components/media_modal/media_modal.vue

@@ -121,7 +121,7 @@ $modal-view-button-icon-width: 3em;
 $modal-view-button-icon-margin: 0.5em;
 
 .modal-view.media-modal-view {
-  z-index: 1001;
+  z-index: 9000;
   flex-direction: column;
 
   .modal-view-button-arrow,

src/components/modal/modal.vue

@@ -35,7 +35,7 @@ export default {
 
 <style lang="scss">
 .modal-view {
-  z-index: 1000;
+  z-index: 2000;
   position: fixed;
   top: 0;
   left: 0;