/* Ensure html and body cover the full height of the viewport */
html, body {
    height: 100%;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
}

/* Make the iframe flexibly fill the available space */
iframe {
    flex: 1;
    border: 0;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    body {
        padding: 20px;
        font-size: 14px;
    }
}