.float_top {
        display: none;
        width: 30px;
        height: 30px;
        text-indent: -9999px;
        position: fixed;
        z-index: 999;
        right: 10px;
        bottom: 10px;
        background-color: #FFFFFF;
        -webkit-border-radius: 15px;
        -moz-border-radius: 15px;
        border-radius: 15px;
}