header{position:fixed;top:0;left:0;width:100%;background-color:#fff;box-shadow:0 2px 5px rgba(0,0,0,.1);z-index:10}.top-header{position:relative;color:#fff;width:100%;height:100vh;overflow:hidden}.video-background{position:absolute;top:0;left:0;width:100%;height:100%;overflow:hidden;z-index:-1}.video-background iframe{position:absolute;top:50%;left:50%;width:100%;height:100%;border:0;transform:translate(-50%,-50%);pointer-events:none}