html,body
{
    height: 100%;
	overflow: hidden !important;
    margin:0;padding:0;
}
header,footer
{
   width: 100%; 
   z-index:9999999;
}
.content {
    overflow:auto;
    border: 1px solid #ddd;
    height:80%;
    width: 98%;
    background:white;
    margin-top: -1px;
    padding-top:10px;
   
}
.block
{
    width: 50%;
    height: 50%;
    display: inline-block;
    border: 1px solid #ddd;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
    text-align: center;
}
header
{
    border: 1px solid #ddd;
    width :98%;
    height: 55px;
    background:white;
    position: relative;
    z-index:2;
}
footer
{
    width :98%;
    border: 1px solid #ddd;
    height: 30px;
    background: gray;
    position: relative;
    z-index:1;
}