if you are often using doc.sccode.org and you prefer light text on dark backgrounds, here’s a simple CSS snippet to add to Stylus Add-On that turns that resource into one with inverted colors. It also adds max-width option so that on wide screens text does not become unreadable because of long lines.
body {
background: #222;
color: #333;
-webkit-filter: invert(100%) !important;
filter: invert(100%) !important;
max-width:700px;
margin:auto;
}
.contents {
border: solid 1px white;
background: #ccc;
}