Front-end daily combat: # 145 video demonstrates how to create a power switch control with pure CSS

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https://codepen.io/comehope/pen/PdMyJd

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https://scrimba.com/p/pEgDAM/c648Nu7

Source code download

Daily front-end combat series full source code can be downloaded from github:

https://github.com/comehope/front-end-daily-challenges

Code Reading

Defined dom, comprising three elements, representing the inputcontrols, switches and lights:

<input type="checkbox" class="toggle">
<div class="switch"></div>
<div class="light"></div>

Centered:

body {
    margin: 0;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #eee;
}

Style definition of the control, the control is set to transparent, so that it is not visible, but can still interact with the user. Wherein the font size is variable, because the inputfont size is different from the control body text, it is necessary to set separately:

body {
    font-size: var(--font-size);
}

:root {
    --font-size: 16px;
}

.toggle {
    position: absolute;
    font-size: var(--font-size); 
    width: 5em;
    height: 8em;
    margin: 0;
    filter: opacity(0);
    cursor: pointer;
    z-index: 2;
}

Switch setting contour:

.switch {
    position: absolute;
    width: 5em;
    height: 8em;
    border-radius: 1.2em;
    background: linear-gradient(#d2d4d6, white);
}

The switch becomes shaded perspective:

.switch {
    box-shadow: 
        inset 0 -0.2em 0.4em rgba(212, 212, 212, 0.75), 
        inset 0 -0.8em 0 0.1em rgba(156, 156, 156, 0.85), 
        0 0 0 0.1em rgba(116, 116, 116, 0.8), 
        0 0.6em 0.6em rgba(41, 41, 41, 0.3), 
        0 0 0 0.4em #d4d7d8;
}

Pseudo-element is set onand offthe text, is now in offstate:

.toggle ~ .switch::before,
.toggle ~ .switch::after {
    position: absolute;
    width: 100%;
    text-align: center;
    font-size: 1.4em;
    font-family: sans-serif;
    text-transform: uppercase;
}

.toggle ~ .switch::before {
    content: '|';
    bottom: 1em;
    color: rgba(0, 0, 0, 0.5);
    text-shadow: 0 0.1em 0 rgba(255, 255, 255, 0.8);
}

.toggle ~ .switch::after {
    content: 'O';
    top: 0.6em;
    color: rgba(0, 0, 0, 0.45);
    text-shadow: 0 0.1em 0 rgba(255, 255, 255, 0.4);
}

The inputcontrol is set to checkedstate, in order to set the onstyle state:

<input type="checkbox" checked="checked" class="toggle">

Disposed in ona switching pattern state:

.toggle:checked ~ .switch {
    background: linear-gradient(#a1a2a3, #f0f0f0);
    box-shadow: 
        inset 0 0.2em 0.4em rgba(212, 205, 199, 0.75), 
        inset 0 0.8em 0 0.1em rgba(255, 255, 255, 0.77), 
        0 0 0 0.1em rgba(116, 116, 118, 0.8), 
        0 -0.2em 0.2em rgba(41, 41, 41, 0.18), 
        0 0 0 0.4em #d4d7d8;
}

Set in a ontext style state:

.toggle:checked ~ .switch::before {
    bottom: 0.3em;
    text-shadow: 0 0.1em 0 rgba(255, 255, 255, 0.5);
}

.toggle:checked ~ .switch::after {
    top: 1.2em;
    text-shadow: 0 0.1em 0 rgba(255, 255, 255, 0.15);
}

Next, set the lighting effects.
First set up in offa dark state the effect of:

.toggle ~ .light {
    width: 100vw;
    height: 100vh;
    background-color: #0a0a16;
    z-index: 1;
    filter: opacity(0.7);
}

And then set in ona bright effect state:

.toggle:checked ~ .light {
    filter: opacity(0);
}

We're done!