Fix invisible message detail scrollbar

// FREEBIE

stylesheets/_conversation.scss

@@ -7,6 +7,10 @@
   .panel {
     height: 100%;
   }
+
+  ::-webkit-scrollbar-thumb {
+    background: rgba(0,0,0,0.15);
+  }
 }
 .conversation-title {
   display: block;
@@ -224,16 +228,13 @@
     }
   }
 
-  &::-webkit-scrollbar-thumb {
-    background: rgba(0,0,0,0.15);
-  }
-
 }
 
 .message-detail,
 .message-list {
   list-style: none;
 
+
   li {
     margin: 0 8px 16px;
 

stylesheets/manifest.css

@@ -543,6 +543,8 @@ input.search {
   border-radius: 10px; }
   .conversation .panel {
     height: 100%; }
+  .conversation ::-webkit-scrollbar-thumb {
+    background: rgba(0, 0, 0, 0.15); }
 
 .conversation-title {
   display: block;
@@ -698,8 +700,6 @@ input.search {
     cursor: pointer; }
     .message-list .timestamp:hover {
       text-decoration: underline; }
-  .message-list::-webkit-scrollbar-thumb {
-    background: rgba(0, 0, 0, 0.15); }
 
 .message-detail,
 .message-list {