body {
    font-family: sans-serif;
    background-color: #f9f9f9; /* Light grey background */
    color: #333;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.container {
    width: 80%;
    max-width: 600px;
    background-color: #fff; /* White container */
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    margin: 20px;
}

header {
    text-align: center;
    padding-bottom: 20px;
    border-bottom: 1px solid #eee;
}

h1, h2 {
    color: #555;
}

#cashback-info {
    margin-bottom: 20px;
    padding: 15px;
    background-color: #f2f2f2; /* Light grey section background */
    border-radius: 5px;
}

.form-group {
    margin-bottom: 15px;
}

label {
    display: block;
    margin-bottom: 5px;
    color: #666;
}

input[type="text"],
input[type="tel"] {
    width: 100%;
    padding: 8px;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box; /* Important: Keeps padding inside the element's total width */
}

button {
    background-color: #ddd; /* Light grey button */
    color: #333;
    padding: 10px 15px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s ease;
}

button:hover {
    background-color: #ccc;
}

footer {
    text-align: center;
    margin-top: 20px;
    padding-top: 10px;
    border-top: 1px solid #eee;
    color: #777;
}

#form-message {
    margin-top: 15px;
    padding: 10px;
    border-radius: 4px;
    display: none;
}

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

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

/* Mobile responsiveness */
@media (max-width: 768px) {
    .container {
        width: 95%;
        margin: 10px;
    }
}