body {
    font-family: "Microsoft JhengHei", sans-serif;
    margin: 0;
    padding: 0;
    background: #f6f8fa;
    color: #333;
}

.wrapper {
    max-width: 480px;
    margin: auto;
    padding: 20px;
    text-align: center;
}

h1 {
    font-size: 1.8em;
    margin-bottom: 1em;
}

.set {
    background: #fff;
    margin: 1em 0;
    padding: 1em;
    border-radius: 10px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}

button {
    padding: 0.8em 1.5em;
    font-size: 1em;
    background-color: #4CAF50;
    border: none;
    color: white;
    border-radius: 8px;
    cursor: pointer;
}

button:hover {
    background-color: #45a049;
}