[Webui] Fix style bug

Small 
<a href="http://imgur.com/KbtWee5"><img src="http://i.imgur.com/KbtWee5.png" title="Hosted by imgur.com"/></a>

Medium
<a href="http://imgur.com/dMDIxaa"><img src="http://i.imgur.com/dMDIxaa.png" title="Hosted by imgur.com" /></a>

More than medium
<a href="http://imgur.com/oyhzutC"><img src="http://i.imgur.com/oyhzutC.png" title="Hosted by imgur.com"/></a>