.slider {
    border  : solid 1px #888888;
    height  : 20px;
    background-color : #000000;
    position         : relative;
}

.slider_tab {
    width  : 7px;
    height : 20px; 
    background-color: #888888;
    position:absolute;
    top: 0px;
    cursor:move;
}

.slider_value {
    position:absolute;
    color:#ffffff;
}