body{   
    background-color: black;
    height: 2000px;
}
.scroll1{
    position: fixed;
    width: 100%;
    height: 10px;
    background-color: red;
    top: 0px;
    left: 0px;
    
}

.scroll2{
    position: fixed;
    width: 100%;
    height: 10px;
    background-color: green;
    top: 0px;
    left: 0px;
}