From James Van Dyne
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My collection of grease monkey scripts I use to make the web work better for me.

Header Color

Changes the background of an element red. Useful for when you want an easy visual distinction that your on your own repository.

// ==UserScript==
// @name     header color
// @version  1
// @grant    none
// @include*
// @run-at document-idle
// ==/UserScript==

function addStyleBlock(cssString) {
  let head = document.getElementsByTagName("head")[0];
  let newCss = document.createElement("style");
  newCss.type = "text/css";
  newCss.innerHTML = cssString;

function appendClass(element, className) {
addStyleBlock (".red-background { background-color: #FF000085 !important; }");

// Github Header
let header = document.getElementById("js-repo-pjax-container");
if(header) {
   appendClass(header.getElementsByTagName("div")[0], "red-background");