.left-red-triangle{position:absolute;z-index:-1;left:-50px;top:30px}.right-bg-box{position:absolute;z-index:-1;right:0;top:0;width:200px;height:700px;overflow:hidden}.right-red-box{position:absolute;right:-60px;top:0}.right-red-square{position:absolute;right:-140px;top:360px;transform:rotate(55deg)}@media (min-width:640px){.left-red-triangle{left:0;top:70px}.right-red-box{right:0;top:60px}}