body {
    font-family: Arial, sans-serif;
    margin: 0;
    background-color: #f4f6f8;
}
header {
    background-color: #1563ab;
    padding: 15px;
    color: white;
}
header a {
    color: white;
    margin-right: 15px;
    text-decoration: none;
    font-weight: bold;
}
main {
    padding: 30px;
}
.card {
    background: white;
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}
button {
    padding: 10px 15px;
    background-color: #2563eb;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}
button:hover {
    background-color: #1d4ed8;
}