moving the :hover to img only

index/stylesheet.css

@@ -123,10 +123,10 @@ section{
 	color:inherit;
 	text-decoration: none;
 }
-.issue a, .issue a:active, .issue a:visited{
+a img{
 	-webkit-filter:grayscale(100%);
 }
-a:hover{
+a img:hover{
 	-webkit-filter:grayscale(0%);
 }