.mod-ad-collapse {
    position: relative;
    display: block;
}
.mod-ad-collapse .btns{
   position: absolute;
   width: 1200px;
   top:0;
   left: 50%;
   margin-left: -600px;
}
.mod-ad-collapse .btn {
    position: absolute;
    top: 10px;
    right: 10px;
    width: 24px;
    height: 24px;
    line-height: 24px;
    text-align: center;
    text-indent: 999px;
    background-color: #666;
    border-radius: 50%;
    padding: 0;
    color: #fff;
    text-decoration: none;
    display: none;
    background: url(../img/icon1.png) no-repeat;
}

.mod-ad-collapse .btn-close{
    background-position: 0 -385px;
}
.mod-ad-collapse .btn-up{
   background-position: 0 -409px;
}
.mod-ad-collapse .img img{
   max-width:100%
}