.rock{--rock-alpha:.3;--rock-image:url(../images/model/rock.jpeg);background-image:linear-gradient(to right,rgba(0,0,0,.9) 0,rgba(0,0,0,var(--rock-alpha)) 60%,transparent 100%),var(--rock-image);background-position:50%;background-size:cover}.rock--text-right{background-image:linear-gradient(to left,rgba(0,0,0,.9) 0,rgba(0,0,0,var(--rock-alpha)) 60%,transparent 100%),var(--rock-image);background-position:0}