如何使用纯CSS实现电源开关控件（附源码）

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

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

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

.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;
}

.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);
}

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

.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;
}

.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);
}

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

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