body {
    font-family: Arial;
    background: #f2f2f2;
    margin: 0;
}

header {
    background: #333;
    padding: 15px;
}

nav a {
    color: white;
    margin-right: 15px;
    text-decoration: none;
}

.card {
    background: white;
    width: 400px;
    margin: 40px auto;
    padding: 20px;
    border-radius: 8px;
}

input, select {
    width: 100%;
    padding: 8px;
    margin-top: 10px;
}

input[type=submit] {
    background: #0066ff;
    color: white;
    border: none;
    padding: 10px;
    margin-top: 12px;
}
.error {
    background: #ffd6d6;
    padding: 10px;
    margin-bottom: 10px;
    border-left: 5px solid red;
}