done

css/base.css

@@ -395,6 +395,10 @@ div.alert .content {
     inset 0 -0.25rem 0.25rem -0.25rem rgba(0,0,0,0.15);
 }
 
+.hr.thin {
+  height: 0.015rem;
+}
+
 /* Element which can take focus but shows no outline */
 .group-focus {
   outline: none;
@@ -780,6 +784,10 @@ i.search {
   overflow: hidden;
 }
 
+.flex-column.narrow {
+  height: auto;
+}
+
 .scrollable-panel {
   overflow-y: auto;
   margin-top: 0.25rem;
@@ -1317,6 +1325,10 @@ i.search {
   box-shadow: 0px -2px 3px -1px rgba(0,0,0,0.1); /* Faint shadow above panel */
 }
 
+#image-preview-container .material-icons {
+  font-size: 6rem;
+}
+
 /* Talk bubbles */
 .chat-box {
   list-style: none;