html {
    background-color: black;
    color: white;
    font-family: monospace, sans-serif
}
textarea {
    background-color: black;
    color: white;
    width: 100%;
    height: 10em;
    resize: vertical;
}
iframe {
    background-color: white;
    color: black;
    font-family: unset;
    width: 100%;
    height: 20em;
}