.mb{margin:0;padding:320px 0 0 20px;width:280px;}

.mb{zoom:1;}
.mb:after {
    content:"."; 
    display:block; 
    height:0; 
    clear:both;
    visibility:hidden;
}

.mb{display:inline-table;}
/* Hides from IE-mac \*/
* html .mb {height: 1%;}
.mb {display: block;}
/* End hide from IE-mac */