.banner-section{
    background:url("https://deliriumnerd.com/wp-content/uploads/2018/01/anne.jpg"); 
    opacity: .6;
    position: absolute;
    left: 0px;
    top: 0px;
    width: 100%;
    height: 100%;
    z-index: -1; 
    background-size:cover; 
    background-position:0;}