.sidr{
    display:none;
    position:absolute;
    position:fixed;
    top:0;
    height:100%;
    z-index:1000;
    width:260px;
    overflow-x:none;
    overflow-y:auto;
}

.sidr.right{left:auto;right:-260px; float: right;}

.sidr.left{right:auto;left:-260px; float: left;}