*{box-sizing:border-box;outline:0}a{color:inherit}body{background-color:#1e1e1e;color:#fff;cursor:default;font-family:Helvetica,sans-serif;font-size:16px;margin:0;-webkit-tap-highlight-color:transparent}header{background-color:rgba(255,255,255,.1);padding:10px 15px;-webkit-user-select:none;user-select:none}h1{margin:15px 0}main{display:block;margin:15px}.bg-img{background-attachment:fixed;background-image:url(https://bing.shangzhenyang.com/api/1080p);background-position:center;background-repeat:no-repeat;background-size:cover;-webkit-filter:blur(10px);filter:blur(10px);height:100%;left:0;opacity:.5;position:fixed;top:0;transform:scale(1.1);width:100%;z-index:-1}