html,body{height:100%;margin:0;padding:0}body,#app{background:#f5f5f5;height:100%}h1{font-size:1.2rem;margin-bottom:1rem;text-align:center}h2{font-size:1.2rem;margin-bottom:.5rem}h3{font-size:1rem;margin-bottom:.5rem}main{max-width:600px;margin:10px auto;padding:2vw;background:#fff;border-radius:10px}