*{box-sizing:border-box}body{font-family:sans-serif;margin:0;padding:0}#app{max-width:480px;margin:2rem auto;padding:1rem}h1,.add-habit{margin-bottom:1.5rem}input{padding:.4rem .6rem;margin-right:.5rem;font-size:1rem;border:1px solid #ccc;border-radius:4px;width:260px}button{padding:.4rem .8rem;cursor:pointer}ul{list-style:none;padding:0}li{display:flex;justify-content:space-between;padding:.4rem 0;border-bottom:1px solid #eee}li.done span{text-decoration:line-through;color:#999}.summary{margin-top:1rem;padding:.8rem;background:#f5f5f5}