Index: css/components/_main.scss
===================================================================
--- css/components/_main.scss	(revision 11148)
+++ css/components/_main.scss	(working copy)
@@ -231,12 +231,12 @@
 	display: block;
 	margin: 0 auto;
 	height: auto;
-	max-height: 300px;
 	left: 0;
 	position: inherit;
 	top: 0;
 	-webkit-transform: translateZ( 0 );
 	transition: opacity 0.2s ease-in-out;
+	aspect-ratio: 4/3;
 }
 
 .theme-browser .theme:hover .theme-screenshot img,