.main-bg{position:relative}.main-bg:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;z-index:-1;background-image:url(/images/backgroud.jpg);background-size:cover;background-position:center;background-repeat:no-repeat;opacity:.25;mask-image:radial-gradient(ellipse at center,black 30%,transparent 75%);-webkit-mask-image:radial-gradient(ellipse at center,black 30%,transparent 75%)}