feat: scale down images to 258x200, fix aspect ratio in css

reduces file size from 19,6MB to 3,4MB

css/style.css

@@ -199,7 +199,7 @@
 
 #stylePreviewOverlay {
     display: none;
-    width: 120px;
+    width: 130px;
     height: 100px;
     position: fixed;
     top: 0px;