Light / Dark Mode Toggle Switch

index.html

    <div class="container">
        <h1>Light / Dark Mode</h1>
        <div class="toggle-container">
            <input type="checkbox" id="switch" name="theme" /><label for="switch">Toggle</label>
        </div>

        <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Quos ducimus repellendus dolorem eum consequatur id exercitationem nesciunt, inventore modi perferendis impedit esse, tempora officia, ipsam quae libero. Nostrum, alias dignissimos.</p>
    </div>

light-dark-mode-toggle-switch.markdown

Light / Dark Mode Toggle Switch

A Pen by Mike Greeff on CodePen.

License.

script.js

        var checkbox = document.querySelector('input[name=theme]');

        checkbox.addEventListener('change', function() {
            if(this.checked) {
                trans()
                document.documentElement.setAttribute('data-theme', 'dark')
            } else {
                trans()
                document.documentElement.setAttribute('data-theme', 'light')
            }
        })

        let trans = () => {
            document.documentElement.classList.add('transition');
            window.setTimeout(() => {
                document.documentElement.classList.remove('transition')
            }, 1000)
        }

style.scss

html {
    height: 100%;
    font-family: 'Montserrat';

    display: grid;
    align-items: center;
    justify-items: center;

    --bg: #FCFCFC;
    --bg-panel: #EBEBEB;
    --color-headings: #0077FF;
    --color-text: #333333;
}

html[data-theme='dark'] {
    --bg: #333333;
    --bg-panel: #434343;
    --color-headings: #3694FF;
    --color-text: #B5B5B5;
}

body {
    background-color: var(--bg);
}

.container {
    background-color: var(--bg-panel);
    margin: 5em;
    padding: 5em;
    border-radius: 15px;

    display: grid;
    grid-template-columns: 80% auto;
    grid-template-rows: auto auto;
    grid-template-areas:
        "title switch"
        "content content";

    h1 {
        margin: 0;
        color: var(--color-headings);
    }

    p {
        color: var(--color-text);
        grid-area: content;
        font-size: 1.1em;
        line-height: 1.8em;
        margin-top: 2em;
    }
}



input[type=checkbox]{
	height: 0;
	width: 0;
	visibility: hidden;
}

label {
	cursor: pointer;
	text-indent: -9999px;
	width: 52px;
	height: 27px;
	background: grey;
	float: right;
	border-radius: 100px;
	position: relative;
}

label:after {
	content: '';
	position: absolute;
	top: 3px;
	left: 3px;
	width: 20px;
	height: 20px;
	background: #fff;
	border-radius: 90px;
	transition: 0.3s;
}

input:checked + label {
	background: var(--color-headings);
}

input:checked + label:after {
	left: calc(100% - 5px);
	transform: translateX(-100%);
}

label:active:after {
	width: 45px;
}

html.transition,
html.transition *,
html.transition *:before,
html.transition *:after {
  transition: all 750ms !important;
  transition-delay: 0 !important;
}