.custom-parallax{position:relative;overflow:hidden}.custom-parallax:before{content:'';position:absolute;top:0;right:0;bottom:0;left:0;background:url('path-to-your-image.jpg') center/cover no-repeat fixed;z-index:-1}@media not all and (min-resolution:.001dpcm){.custom-parallax:before{background-attachment:scroll}}