html, body {
    margin: 0;
    padding: 0;
    height: 100%;
    overflow: hidden; /* Prevents scrollbars on the main page */
}

#full-page-iframe {
    border: none; /* Removes the default iframe border */
    width: 100%;
    height: 100%;
    display: block; /* Ensures it takes up full width/height */
}