body {
    font-family: Arial, sans-serif;
    background: #f4f4f4;
}

.container {
    max-width: 600px;
    margin: 50px auto;
    background: white;
    padding: 20px;
    border-radius: 10px;
}

.btn {
    display: inline-block;
    padding: 10px 15px;
    background: black;
    color: white;
    text-decoration: none;
    border-radius: 6px;
    margin: 5px 0;
}

input, textarea, select {
    width: 100%;
    padding: 10px;
    margin: 7px 0;
}

.card {
    background: #fafafa;
    padding: 10px;
    border-radius: 8px;
    margin: 10px 0;
    border: 1px solid #ddd;
}

.error {
    color: red;
}