ul.thumb {
float: left;
list-style: none;
padding: 10px;
width: 750px;
background-color: #0e80c4;
margin-left:70px;
margin-right:auto;
}

ul.thumb li
 {margin: 0; 
 padding: 5px;
 float: left;
 position: relative;
 width: 105px;
 height: 105px;}

ul.thumb li img {
width: 100px;
 height: 80px;
 padding: 5px;
 background: #71B662;
 position: absolute;
 left: 0;
 top: 0;-ms-interpolation-mode: bicubic; }

ul.thumb li img.hover
{margin-top:15px;
background:url(../img/thumb_bg.png) no-repeat center center;
border: none;}