.parallax-img{height:100%;width:100%;object-fit:cover;overflow:hidden;z-index:-5;position:relative;mask-image:linear-gradient(180deg,#000 50%,transparent);transition:opacity .3s ease-in-out}.parallax{position:absolute;z-index:-5;height:100vh;width:100%;top:0;left:0;right:0;opacity:.8;will-change:opacity,transform}