Made preview images smaller

editor/css/editor.css

@@ -54,7 +54,8 @@ div#ks-editor textarea, div#ks-editor input[type="text"] {
 }
 
 div#ks-editor img.preview-image {
-    max-width: 5rem;
+    max-width: 3rem;
+    max-height: 3rem;
     height: auto;
 }