WIP: image preview

Author: antis81

Diff for: css/welcome.css

@@ -118,6 +118,12 @@ header h2 {
   z-index: -1;
 }
 
+#preview:before {
+  content: "";
+  top: 0; left: 0; bottom: 0; right: 0;
+  position: absolute;
+  z-index: -1;
+}
 #preview {
   table-layout: fixed;
   width: 90%;