.close {position:relative;float:left;display:inline-block;*display:inline;width:50px;height:50px;text-align:center;margin-right:20px;}
.close1:after {content: "\00d7"; font-size:15pt;line-height:50px;}
.close2:after {content: "\00d7"; font-size:25pt;line-height:45px;}
.close3:after {content: "\00d7"; font-size:50pt;line-height:35px;}
<div class="close close1"></div> <div class="close close2"></div> <div class="close close3"></div>