body {
    font-family: Arial, Helvetica, sans-serif;
    background: #f9f9f9;
    margin: 0;
    padding: 0;
    text-align: center;
}
header {
    background: #4CAF50;
    color: #fff;
    padding: 20px;
    font-size: 1.4rem;
}
.container {
    max-width: 600px;
    margin: 40px auto;
    background: #fff;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0,0,0,.08);
}
.cta-btn {
    display: inline-block;
    margin-top: 20px;
    background: #4CAF50;
    color: #fff;
    padding: 12px 24px;
    border-radius: 8px;
    text-decoration: none;
}
.notice {
    margin-top: 15px;
    color: #555;
}