body {
    font-family: "Microsoft YaHei", sans-serif;
    max-width: 800px;
    margin: 0 auto;
    padding: 9px;
    background-color: #f5f7fa;
}

.container {
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 30px;
    margin-top: 50px;
}

h1 {
    color: #2c3e50;
    text-align: center;
    margin-bottom: 30px;
}

.download-btn {
    display: block;
    width: 100%;
    padding: 9px;
    margin: 20px 0;
    text-align: center;
    background-color: #3498db;
    color: white;
    text-decoration: none;
    border-radius: 5px;
    font-size: 18px;
    transition: background-color 0.3s;
    border: none;
    cursor: pointer;
}

.download-btn:hover {
    background-color: #2980b9;
}

.btn-2 {
    background-color: #2ecc71;
}

.btn-2:hover {
    background-color: #27ae60;
}

.instructions {
    margin-top: 30px;
    padding: 15px;
    background-color: #eaf2f8;
    border-radius: 5px;
    font-size: 14px;
}