body {
    font-family: Arial, sans-serif;
    background: #f3f3f3;
    padding: 20px;
}

.container {
    max-width: 700px;
    margin: auto;
    background: white;
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

button {
    padding: 10px 20px;
    margin: 10px 0;
    background: #007BFF;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}