/* Add this CSS to your <style> section or an external stylesheet */

html, body {
    height: 100%;
    margin: 0;
    padding: 0;
}

body {
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
}

footer {
    flex-shrink: 0;
    background-color: #333;
    color: white;
    padding: 10px;
    text-align: center;
}