a.thumbx img{
background-image:url(http://1.bp.blogspot.com/-zW4if-Rh02I/UIw0p6_8I7I/AAAAAAAAGSs/mLqIRZTpNic/s1600/icon-hover.png); background-position:50% 50%; background-repeat:no-repeat
display:block;width:100%}

indexte 452.satırı şu şekilde değişirmisin