mastodon-color-scheme-changer.user.js

// ==UserScript==
// @name         Color Changer
// @namespace    https://qiitadon.com/
// @version      0.1
// @description  Change mastodon color scheme easily.
// @author       Akira Nakagawa
// @match        https://qiitadon.com/*
// @grant        none
// ==/UserScript==

function setColorScheme (degree) {
    'use strict';
    var st=$("#color-scheme")||document.createElement("style");
    st.type = 'text/css';
    st.id="color-scheme";
    st.innerText = "body {filter:hue-rotate(" + degree + "deg)}" +
        "img,.account__avatar,textarea,.account__header,.account__avatar-overlay-base,.account__avatar-overlay-overlay,.getting-started,.compose-form__upload-thumbnail{filter:hue-rotate(" + (360-degree) + "deg)}";
    var pr=document.getElementsByTagName("script")[0];
    pr.parentNode.insertBefore(st,pr);
}