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.img img {width:200px;height:200px;}
.img span {width:200px;height:200px;display:block;position:absolute}
.img span:hover {display:block;background:url(http://www.sabotagetimes.com/wp-content/themes/sabotage/images/play.png)no-repeat center center;}
demo:sefakilic.com.tr/stil ()