Fix for issue #2557

#2557 Avatar height issue in Safari.

scp/css/scp.css

@@ -944,7 +944,7 @@ img.avatar {
 }
 .avatar > img.avatar {
     width: 100%;
-    height: 100%;
+    height: auto;
 }
 .thread-entry .header {
     padding: 8px 0.9em;