.app{height:100%;background-color:snow}a{text-decoration:none;color:inherit;cursor:pointer}ul{list-style-type:none}*{font-family:HappyZcool;margin:0;padding:0}::-webkit-scrollbar{width:5px}::-webkit-scrollbar-thumb{background:#bdbdbd;border-radius:30px}.app_box{position:relative;width:1200px;margin:0 auto}