body {
    font-family: Arial, sans-serif;
    text-align: center;
    background-color: #f4f4f4;
    margin: 0;
    padding: 0;
}
.container {
    max-width: 500px;
    margin: 50px auto;
    padding: 20px;
    background: white;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    border-radius: 10px;
}
h1 {
    color: #333;
}
p {
    font-size: 18px;
    color: #666;
}
.call-btn {
    display: inline-block;
    background-color: #ff0000;
    color: white;
    padding: 15px 20px;
    font-size: 20px;
    text-decoration: none;
    border-radius: 5px;
    margin-top: 20px;
}
.call-btn:hover {
    background-color: #cc0000;
}