Pad bottom of costume/sound list to allow you to reach the bottom tile

src/components/asset-panel/selector.css

@@ -49,6 +49,8 @@ $fade-out-distance: 100px;
     overflow-y: scroll;
     display: flex;
     flex-direction: column;
+    /* Make sure there is room to scroll beyond the last tile */
+    padding-bottom: 70px;
 }
 
 .list-item {