body{font-family:"helvetica neue",arial,sans-serif;font-size:14px;color:#1f2025;background-color:#fefefe}a{text-decoration:none}.text-center{text-align:center}#app{width:800px;margin:0 auto}.main-nav{margin-bottom:50px}.main-nav ul{list-style:none;padding:0;margin:0;font-weight:600}.main-nav ul li{display:inline-block;padding:0 10px}