Night theme for api.flutter.dev

night_theme_flutter_api.js

// ==UserScript==
// @name         Fix flutter.dev Night theme
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Enables night theme for documentation site api.flutter.dev
// @author       Andrew S
// @match        https://api.flutter.dev/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    // Your code here...
    window.addEventListener('load', (event) => {
        const cssFontColor = 'color: #d3d4d4 !important;';

        const el = document.querySelector('body');
        if (el) {
            el.style.cssText = 'font-weight: 400 !important; background-color: #031f30; ' + cssFontColor;
        }

        const selectors2FixColor = ['dd', 'h1', 'h2', 'h3', 'h4', 'h5'];
        selectors2FixColor.forEach(function(s) {
            let els = document.querySelectorAll(s);
            if (els) {
                els.forEach(function(el) {
                    el.style.cssText = cssFontColor;
                });
            }
        });
    });
})();