body {
    font-family: Arial, sans-serif;
    margin: 20px;
    background: #f9f9f9;
}
.container {
    max-width: 1000px;
    margin: auto;
    background: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
h2, h3 {
    color: #333;
}
input, select, button {
    padding: 8px;
    margin: 5px 0;
}
button {
    background: #007bff;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}
button:hover {
    background: #0056b3;
}
.error {
    color: red;
}