Darkmode-css
<script>
page = document.createElement('style');
page.innerHTML = "html {filter: invert(100%) hue-rotate(180deg); transition: 3s; background-color: black;}";
document.body.appendChild(page);
page = document.createElement('style');
page.innerHTML = "iframe,video,img,.dashboard-card,.tile {filter: invert(100%) hue-rotate(180deg);transition: 4s;}";
document.body.appendChild(page);
</script>