dong.js

var all = document.getElementsByTagName('*');
var courseList = document.getElementsByClassName('_1Z0RM _1tpub Card-card-data-17m6S')
var loc = document.location.href;

var mainColor = '#191414';
var altColor = '#191914';

function setColor(element, color) {
    element.style.backgroundColor = color;
}

function whiteOut() {
    document.body.style.backgroundColor = mainColor;
    for (i in all) {
        if (!isNaN(i)) { all[i].style.color = 'white' }
    }
}

function setArrayColor(array, color) {
    for (i in array) {
        var element = array[i];
        setColor(element, color)
    }
}

function homePage() {
    var mainInner = document.getElementById('main-inner');
    var main = document.getElementById('main')
    var homeFeed = document.getElementById('home-feed-container');
    var upcoming = document.getElementsByClassName('upcoming-events upcoming-events-wrapper sEventUpcoming-processed')[0];
    var overdue = document.getElementById('overdue-submissions');

    var darkBlack = [main, mainInner];
    var lightBlack = [upcoming, overdue, homeFeed];

    setArrayColor(darkBlack, mainColor);
    setArrayColor(lightBlack, altColor);
}

function gradePage() {
    var gradeBackground = document.getElementById('main-content-wrapper');
    var downloadButton = document.getElementsByClassName('link-btn download popups-processed sExtlink-processed')[0];

    var lightBlack = [gradeBackground];

    gradeBackground.style.border = '0px';
    downloadButton.style.color = 'black';

    setArrayColor(lightBlack, altColor);
}

function coursePage() {
    var courseBackground = document.getElementById('main-content-wrapper');
    var unfolder = document.getElementsByClassName('action-links-unfold ')[0];
    var actionLinks = document.getElementsByClassName('action-links ')[0];
    //left off with activeButton
    var activeButton = document.getElementsByClassName('link-wrapper menu-813 course-materials-left-menu active-trail-dist-1')
    console.log(activeButton);

    var lightBlack = [courseBackground];

    courseBackground.style.border = '0px';
    unfolder.style.backgroundColor = altColor;
    actionLinks.style.backgroundColor = mainColor;

    setArrayColor(lightBlack, altColor);
}

var toRun = {
    'https://lms.fcps.org/home':homePage,
    'https://lms.fcps.org/grades/grades':gradePage,
}

if (toRun[loc]) {
    whiteOut();
    toRun[loc]()
} else if (loc.includes('course')) {
    coursePage();
    whiteOut();
}