body {
    font-family: Arial, sans-serif;
    text-align: center;
    background-color: #f8f9fa;
    margin: 0;
    padding: 0;
}

.message {
    margin: 20px auto;
    padding: 10px;
    width: 75%;
    border-radius: 5px;
    text-align: center;
    font-size: 24px;
}

.message.success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.message.error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.hidden {
    display: none;
}

input[type="tel"] {
    width: 75%;
    height: 120px;
    font-size: 64px;
    font-weight: bold;
    text-shadow: 2px 2px 2px black;
    border: none;
    border-radius: 10px;
    background-color: #00FFFF;
    color: black;
    margin: 10px auto;
}

input[type="submit"] {
    width: 20%;
    height: 120px;
    font-size: 64px;
    font-weight: bold;
    text-shadow: 1px 1px 1px black;
    background-color: red;
    color: white;
    border: none;
    border-radius: 10px;
    cursor: pointer;
}

input[type="submit"]:hover {
    background-color: darkred;
}