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HTML

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>WEB BEKS</title>
  <link rel="stylesheet" href="style (13).css">
  <style>
    body{
      display: flex;
      justify-content: center;
      align-items: center;
      height: 100vh;
    }
  </style>
</head>
<body>
  <svg display="none">
    <symbol id="light" viewBox="0 0 24 24">
      <g stroke="currentColor" stroke-width="2" stroke-linecap="round">
        <line x1="12" y1="17" x2="12" y2="20" transform="rotate(0,12,12)" />
        <line x1="12" y1="17" x2="12" y2="20" transform="rotate(45,12,12)" />
        <line x1="12" y1="17" x2="12" y2="20" transform="rotate(90,12,12)" />
        <line x1="12" y1="17" x2="12" y2="20" transform="rotate(135,12,12)" />
        <line x1="12" y1="17" x2="12" y2="20" transform="rotate(180,12,12)" />
        <line x1="12" y1="17" x2="12" y2="20" transform="rotate(225,12,12)" />
        <line x1="12" y1="17" x2="12" y2="20" transform="rotate(270,12,12)" />
        <line x1="12" y1="17" x2="12" y2="20" transform="rotate(315,12,12)" />
      </g>
      <circle fill="currentColor" cx="12" cy="12" r="5" />
    </symbol>
    <symbol id="dark" viewBox="0 0 24 24">
      <path fill="currentColor" d="M15.1,14.9c-3-0.5-5.5-3-6-6C8.8,7.1,9.1,5.4,9.9,4c0.4-0.8-0.4-1.7-1.2-1.4C4.6,4,1.8,7.9,2,12.5c0.2,5.1,4.4,9.3,9.5,9.5c4.5,0.2,8.5-2.6,9.9-6.6c0.3-0.8-0.6-1.7-1.4-1.2C18.6,14.9,16.9,15.2,15.1,14.9z" />
    </symbol>
  </svg>
  <label class="switch">
    <input class="switch__input" type="checkbox" role="switch" name="dark" />
    <svg class="switch__icon" width="24px" height="24px" aria-hidden="true">
      <use href="#light" />
    </svg>
    <svg class="switch__icon" width="24px" height="24px" aria-hidden="true">
      <use href="#dark" />
    </svg>
    <span class="switch__inner"></span>
    <span class="switch__inner-icons">
      <svg class="switch__icon" width="24px" height="24px" aria-hidden="true">
        <use href="#light" />
      </svg>
      <svg class="switch__icon" width="24px" height="24px" aria-hidden="true">
        <use href="#dark" />
      </svg>
    </span>
    <span class="switch__sr">Dark Mode</span>
  </label>
</body>

CSS

*{
	border: 0;
	box-sizing: border-box;
	margin: 0;
	padding: 0;
}
:root{
	--hue: 533;
	--primary: hsl(var(--hue),90%,50%);
	--trans-dur: 0.2s;
	--trans-timing: cubic-bezier(0.65,0,0.35,1);
	font-size: calc(60px + (120 - 60) * (100vw - 320px) / (2560 - 320));
}
body,
input{
	font: 1em/1.5 sans-serif;
}
body{
	background-color: hsl(var(--hue),10%,90%);
	color: hsl(var(--hue),10%,10%);
	display: flex;
	height: 100vh;
	transition: background-color var(--trans-dur), color var(--trans-dur);
}
body:has(.switch__input:checked){
	background-color: hsl(var(--hue),10%,20%);
	color: hsl(var(--hue),10%,90%);
}
.switch,
.switch__input{
	display: block;
	-webkit-tap-highlight-color: transparent;
}
.switch{
	margin: auto;
	position: relative;
	-webkit-user-select: none;
	-moz-user-select: none;
	user-select: none;
}
.switch__icon{
	color: hsla(var(--hue),10%,80%);
	pointer-events: none;
	position: absolute;
	top: 0.375em;
	left: 0.375em;
	width: 0.75em;
	height: 0.75em;
	transition:
		color var(--trans-dur),
		transform var(--trans-dur) var(--trans-timing);
}
.switch__icon:nth-of-type(2){
	right: 0.375em;
	left: auto;
}
.switch__inner,
.switch__inner-icons{
	border-radius: 0.5em;
	display: block;
	overflow: hidden;
	position: absolute;
	top: 0.25em;
	left: 0.25em;
	width: 2.25em;
	height: 1em;
}
.switch__inner:before,
.switch__inner-icons{
	transition: transform var(--trans-dur) var(--trans-timing);
	transform: translateX(-1.25em);
}
.switch__inner:before{
  background-color: var(--primary);
	border-radius: inherit;
	content: "";
	display: block;
	width: 100%;
	height: 100%;
}
.switch__inner-icons{
	pointer-events: none;
}
.switch__inner-icons .switch__icon{
	color: hsl(0,0%,100%);
	top: 0.125em;
	left: 0.125em;
	transform: translateX(1.25em);
}
.switch__inner-icons .switch__icon:nth-child(2){
	right: 0.125em;
	left: auto;
}
.switch__input{
	background-color: hsl(0,0%,100%);
	border-radius: 0.75em;
	box-shadow: 0 0 0 0.0625em hsla(var(--hue),90%,50%,0), 0 0.125em 0.5em hsla(var(--hue),10%,10%,0.1);
	outline: transparent;
	width: 2.75em;
	height: 1.5em;
	-webkit-appearance: none;
	appearance: none;
	transition: background-color var(--trans-dur), box-shadow var(--trans-dur);
} 
.switch__input:checked{
	background-color: hsl(var(--hue),10%,10%);
}
.switch__input:checked ~ .switch__icon{
	color: hsla(var(--hue),10%,40%);
}
.switch__input:checked ~ .switch__inner:before,
.switch__input:checked ~ .switch__inner-icons{
	transform: translateX(1.25em);
}
.switch__input:not(:checked) ~ .switch__icon:first-of-type,
.switch__input:checked ~ .switch__icon:nth-of-type(2) {
	transform: rotate(360deg);
}
.switch__input:checked ~ .switch__inner-icons .switch__icon:first-of-type{
	transform: translateX(-1.25em) rotate(-360deg);
}
.switch__input:checked ~ .switch__inner-icons .switch__icon:nth-of-type(2){
	transform: translateX(-1.25em) rotate(360deg);
}
.switch__input:focus-visible{
	box-shadow: 0 0 0 0.0625em hsla(var(--hue),90%,50%,1), 0 0.125em 0.5em hsla(var(--hue),10%,10%,0.1);
}
.switch__sr{
	overflow: hidden;
	position: absolute;
	width: 1px;
	height: 1px;
}