body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #f4f4f4;
}

header {
    background: #0047AB;
    color: white;
    padding: 20px;
    text-align: center;
}

nav {
    background: #003380;
    padding: 15px;
    text-align: center;
}

nav a {
    color: white;
    text-decoration: none;
    margin: 0 15px;
    font-weight: bold;
}

.container {
    width: 80%;
    margin: 40px auto;
    text-align: center;
}

button {
    background: #0047AB;
    color: white;
    border: none;
    padding: 12px 25px;
    border-radius: 5px;
    cursor: pointer;
}