:root{font-family:Arial,sans-serif}body{color:#fff;background:#1e1e1e;min-height:100vh;margin:0}#app{justify-content:center;align-items:center;min-height:100vh;display:flex}.container{text-align:center;width:100%;max-width:400px}input{border:none;border-radius:6px;width:120px;margin:5px;padding:10px}button{color:#fff;cursor:pointer;background:#646cff;border:none;border-radius:6px;margin:5px;padding:10px 15px;font-size:16px}button:hover{background:#535bf2}#clear{background:#c44}#clear:hover{background:#b33a3a}.card{background:#2c2c2c;border-radius:10px;margin-top:20px;padding:15px}