CSS Variables

by Chuck Tornton

HTML

<script src="https://kit.fontawesome.com/dbaffbfc92.js"></script>
<header>
  <button class="dayOrNight">Day Mode</button>
</header>
<main>
  <div class="inputCont">
    <div class="buttonSearch">
       <i class="fas fa-search"></i>
       <span> Найти</span>
    </div>
    <input class="input" type="text">
  </div>
  <div class="ugolok"></div>
</main>
<footer></footer>

CSS

:root {
    --nightModeHColor: #181521;
    --nightModeMColor: #201c2b;
    --nightModeColor: #392e5c;
    --nightModeFontColor: #dad8de;
    --fontSize: 16px;
    --headerH: 50px;
    --footerH: 100px;
}

html, body {
    margin: 0;
    padding: 0;
    height: 100%;
    display: flex;
    flex-direction: column;
}

header {
    min-height: 50px;
    background: var(--nightModeHColor);
    display: flex;
    align-items: center;
    justify-content: center;
}

main {
    min-height: calc(100% - var(--headerH) - var(--footerH));
    background: var(--nightModeMColor);
    display: flex;
    justify-content: center;
    align-items: center;
}

footer {
    min-height: var(--footerH);
    background: var(--nightModeHColor);
}

.inputCont {
    width: 40%;
    background: var(--nightModeColor);
    height: 40px;
    display: flex;
    flex-direction: row;
}

.buttonSearch {
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--nightModeFontColor);
}

.buttonSearch span {
    margin: 0 10px 0 10px;
}

.buttonSearch i {
    margin: 0 0 0 10px;
    font-size: var(--fontSize);
}

.input {
    background: transparent;
    border: none;
    border-radius: 4px;
    height: 40px;
    outline: none;
    font-size: var(--fontSize);
    color: var(--nightModeFontColor);
    display: flex;
    flex: 1;
}

.ugolok {
    border: 20px solid transparent;
    border-left: 20px solid var(--nightModeColor);
}

JavaScript

let root = document.querySelector(':root');
let rootStyles = getComputedStyle(root);
let mainColor = rootStyles.getPropertyValue('--nightModeHColor');
let dayOrNight = document.querySelector('.dayOrNight');
/* alert(mainColor); */
let numOfClicks = 0;

dayOrNight.addEventListener("click", function(){

    if (this.click) {
        ++numOfClicks;
    }

    if (numOfClicks % 2 ) {
        root.style.setProperty('--nightModeHColor', '#fff');
        root.style.setProperty('--nightModeMColor', 'darkgray');
    } else {
        root.style.setProperty('--nightModeHColor', '#181521');
        root.style.setProperty('--nightModeMColor', '#201c2b');
    }

});