Workaround Chrome rendering issue

www/css/styles.css

@@ -89,11 +89,13 @@ html.md .navbar .link {
 }
 
 #qrcode {
+    width: 10em;
     max-width: 100%;
     max-height: 12em;
 }
 
 .card-expandable #qrcode {
-    height: 50em;
+    width: auto;
+    height: 55em;
     max-height: 50vh;
 }