.bg-slider{
 width: 100vw;
 height: 100vh;
 background-position : center top;
 background-size : 100%;
 display: flex;
 align-items: center;
 justify-content: center;
 background-repeat : no-repeat;
 z-index : 999;
 height : 1340px;
 width : 1200px;
 position : relative;
}