html, body {
    height: 100%;
    margin: 0;
    font-family: Arial, sans-serif;
}

body {
    display: flex;
    flex-direction: column;
    background: linear-gradient(to bottom, #f0f0f0, #d9d9d9);
    color: black;
}

main {
    flex: 1;
}

header, footer {
    background-color: #003366;
    color: white;
    padding: 10px 0;
    text-align: center;
    box-sizing: border-box;
}

a {
    color: #00ff00;
    text-decoration: none;
    margin: 0 15px;
}

a:hover {
    color: orange;
}