#app{font-family:Avenir,Helvetica,Arial,sans-serif;text-align:center;color:#2c3e50;margin-top:60px}form{margin-bottom:20px}input{padding:8px;margin-right:10px}button{padding:8px 16px;margin-left:5px;cursor:pointer}ul{list-style-type:none;padding:0}li{margin:5px 0}input[placeholder]{width:150px}.error-message{color:red;font-weight:700}