body{position:relative;}.background-container{position:fixed;top:0;left:0;width:100%;height:100%;background:url('/assets/images/banner.jpg') center center/cover no-repeat;z-index:1;opacity:0.9;}.container{position:relative;z-index:2;margin:0 auto;}.main,.card,.card-body,.part-main{position:relative;z-index:10;}