Change styles

src/components/gui/gui.css

@@ -176,6 +176,8 @@
     padding-left: $space;
     padding-right: $space;
 
+    min-height: 0; /* this makes it work in Firefox */
+    
     /*
         For making the sprite-selector a scrollable pane
         @todo: Not working in Safari

src/components/sprite-selector/sprite-selector.css

@@ -47,7 +47,7 @@
               then back up, introduces white space in the outside the page container.
     */
     height: calc(100% - $sprite-info-height);
-    overflow-y: scroll;
+    overflow-y: auto;
 }
 
 .items-wrapper {