Code Playground

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
  <div class="toggle">

</div>  
</body>
</html>

@charset "UTF-8";
@import url(https://fonts.googleapis.com/css?family=Nunito+Sans:300,400,600,700,800);
*,
:after,
:before {
  box-sizing: border-box;
  padding: 0;
  margin: 0;
}
@import url('https://fonts.googleapis.com/css2?family=Nanum+Pen+Script&display=swap');

:root {
	--sz: 10vmin;
	--on: #99dc39; 
	--of: #F44336;
	--lg: var(--of);
	--ttf: ease-in-out;
}

*, *:before, *:after {
	box-sizing: border-box;
	/*#btn:checked + label .thumb*/ 
}

body {
	margin: 0;
	padding: 0;
	width: 100vw;
	height: 100vh;
	overflow: hidden;
	display: flex;
	align-items: center;
	justify-content: center;
	background: radial-gradient(circle at 50% 0%, #55555d, #141414);
}

.toggle {
	position: relative;
	width: calc(var(--sz) * 5);
	height: calc(var(--sz) * 3);
	display: flex;
	align-items: center;
	justify-content: center;
}

input {
	display: none;
}

label[for=btn] {
	position: absolute;
	width: calc(var(--sz) * 4);
	height: calc(var(--sz) * 2);
	background: linear-gradient(0deg, #12172080, #0d121780);
	border-radius: var(--sz);
	overflow: hidden;
	box-shadow: 
		0 0 calc(var(--sz) / 50) calc(var(--sz) / 50) #000000e0, 
		0 0 calc(var(--sz) / 10) calc(var(--sz) / 100) #0b0b10 inset;
}

.thumb {
	position: absolute;
	width: calc(calc(var(--sz) * 2) - calc(var(--sz) / 4));
	height: calc(calc(var(--sz) * 2) - calc(var(--sz) / 4));
	top: calc(calc( var(--sz) / 10) + calc(var(--sz) / 50));
	left: calc(calc( var(--sz) / 10) + calc(var(--sz) / 50));
	background: linear-gradient(0deg, #a1a1a1, #ffffff), linear-gradient(0deg, #212121, #474747);
	border-radius: var(--sz);
	cursor: pointer;
	display: flex;
	align-items: center;
	justify-content: center;
	z-index: 1;
	overflow: hidden;
	transition-delay: 0.5s;
	transition-duration: 0.5s;
	transition-timing-function: var(--ttf);
	box-shadow: calc(var(--sz) / -50) calc(var(--sz) / 50) calc(var(--sz) / 30) 0 #fff2 inset, 0 0 calc(var(--sz) / 10) calc(var(--sz) / 50) #000c;
	animation: start 1s var(--ttf) 0s 1;
	background-repeat: no-repeat;
	background-size: 200% 100%, 100% 100%;
	background-position: 200% 0, 0 0;
	background: #fff0;
}

#btn:checked + label .thumb {
	left: calc(calc(100% - calc(calc(var(--sz) * 2) - calc(var(--sz) / 3))) - calc(calc( var(--sz) / 10) + calc(var(--sz) / 10)));
	background-position: 100% 0, 0 0;
	box-shadow: calc(var(--sz) / -50) calc(var(--sz) / 50) calc(var(--sz) / 30) 0 #fff inset, 0 0 calc(var(--sz) / 10) calc(var(--sz) / 50) #000c;
}

@keyframes start {
	100% {
		left: calc(calc(100% - calc(calc(var(--sz) * 2) - calc(var(--sz) / 3))) - calc(calc( var(--sz) / 10) + calc(var(--sz) / 10)));
	}
	0%, 50% {		
		left: calc(calc( var(--sz) / 10) + calc(var(--sz) / 50));
	}
}

.arms {
	position: absolute;
	width: 200%;
	height: 100%;
	border-radius: 10vmin;
	overflow: hidden;
	right: -50%;
}

/* HUMAN */

.arm-human {
	position: absolute;
	width: 14vmin;
	height: 6vmin;
	background: radial-gradient(circle at 20% 80%, #333 0.45vmin, #fff0 calc(0.45vmin + 1px) 100%), radial-gradient(circle at 10% 80%, #333 0.45vmin, #fff0 calc(0.45vmin + 1px) 100%), #575757;
	right: -8%;
	top: calc(50% - 3vmin);
	border-radius: 0.25vmin;
	box-shadow: -3vmin -0.5vmin 0.1vmin -0.65vmin #fff;

/*animation: catch2 1.5s var(--ttf) 0s reverse;*/
}

.hand-human {
	position: absolute;
	background: pink;
	width: 7vmin;
	height: 5vmin;
	left: -9.25vmin;
	border-radius: 21% 10% 80% 37% / 20% 12% 28% 32%;
	z-index: 0;
}

.finger {
	background: pink;
	position: absolute;
	width: 50%;
	height: 25%;
	border-radius: 3vmin 0 0 3vmin;
	left: -2vmin;
	border-left: 2px solid #0006;
	border-bottom: 1px solid #0004;
}

.finger:nth-child(2) {
	top: 25%;
	width: 60%;
	left: -40%;
}
.finger:nth-child(3) {
	top: 50%;
	left: -35%;
	width: 55%;
}
.finger:nth-child(4) {
	top: 75%;
	left: -20%;
	width: 40%;
}

.big-human {
	background: pink;
	border: 1px solid #0004;
	width: 34%;
	height: 26%;
	position: absolute;
	left: -9vmin;
	top: 0.65vmin;
	border-radius: 3vmin 1vmin 1vmin 3vmin;
	border-right-color: #fff0;
	z-index: 1;
}

@keyframes catch {
	0% { right: -8%;}
	25%, 33% { right: 25%; }
	66%, 80% { right: 0%;  }
	100% { right: -5%;  }
}

@keyframes catch2 {
	0% { right: -8%;}
	15%, 35% { right: 25%; }
	65%, 87.5% { right: 0%;  }
	100% { right: -5%;  }
}

#btn:not(:checked) + label .arms .arm-human {
	animation: catch 1.5s var(--ttf) 0s reverse;
}

/* BONES */

@keyframes check-on {
	0% { left: -8%;}
	25%, 33% { left: -2%; }
	66%, 80% { left: 23%;  }
	100% { left: -8%;  }
}

@keyframes check-off {
	0% { left: -8%;}
	25%, 33% { left: 0%; }
	66%, 80% { left: 25%;  }
	100% { left: -8%;  }
}

#btn:checked + label .arms .arm-bones {
	animation: check-on 1.5s var(--ttf) 0s;
}

.arm-bones {
	position: absolute;
	width: 16vmin;
	height: 5vmin;
	left: -8%;
	top: calc(50% - 2.5vmin);
	border-radius: 0.25vmin;
	/* transform: rotateY(180deg); */
	--bone: #ececec;
	/* animation: check-off 1.5s var(--ttf) 0s reverse; */
	--sdw-flt: drop-shadow(-2.5vmin 0vmin 0px var(--bone)) drop-shadow(0 0 1px #000);
	background: linear-gradient(180deg, #25272d, #24262c, #24262c);
	box-shadow: 10vmin 0 0 0 #24272d;
	background-repeat: no-repeat;
	background-size: 80% 100%;
	background-position: 125% 50%;
}

.bone {
	background: var(--bone);
	width: 8vmin;
	height: 2vmin;
	position: absolute;
	transform: rotate(0deg);
	top: 1.5vmin;
	left: -4vmin;
	/*filter: var(--sdw-flt);*/
}

.bone:before, .bone:after,
.big-bones:before, .big-bones:after  {
	content: "";
	background: var(--bone);
	width: 1.5vmin;
	height: 1.5vmin;
	position: absolute;
	left: -0.5vmin;
	top: -0.5vmin;
	border-radius: 100%;
	box-shadow: 8vmin 0 0 0 var(--bone);
}

.bone:after {
	top: calc(100% - 1vmin);
}

.arm-bones > .bone + .bone {
	top: 1.5vmin;
	left: 5.5vmin;
	height: 0.85vmin;
	width: 10.5vmin;
	box-shadow: 0 1.15vmin 0 0 var(--bone);
}
.arm-bones > .bone + .bone:before, 
.arm-bones > .bone + .bone:after {
	box-shadow: 10.15vmin 0 0 0 var(--bone);
}

.arm-bones > .bone + .bone:after {
	top: 100%;
}

/*** Hand ***/

.hand-bones {
	position: absolute;
	--balls: var(--bone) 0.5vmin, #fff0 calc(0.5vmin + 1px) 100%;
	background: 
		radial-gradient(circle at 91% 29%, var(--balls)), 
		radial-gradient(circle at 92% 49%, var(--balls)), 
		radial-gradient(circle at 91% 69%, var(--balls)), 
		radial-gradient(circle at 76% 21%, var(--balls)), 
		radial-gradient(circle at 78% 39%, var(--balls)), 
		radial-gradient(circle at 79% 58%, var(--balls)), 
		radial-gradient(circle at 78% 78%, var(--balls));
	width: 7vmin;
	height: 5vmin;
	left: 16.75vmin;
	z-index: 0;
	transform: rotateY(180deg);
	/*filter: var(--sdw-flt);*/
}

.hand-bones .bone, .big-bones {
	width: 3vmin;
	left: 1.35vmin;
	height: 0.75vmin;
	border-radius: 0.5vmin 0 0 0.5vmin;
}

.hand-bones .bone:before, .hand-bones .bone:after,
.big-bones:before, .big-bones:after {
	width: 0.8vmin;
	height: 0.8vmin;
	top: -0.25vmin;
	left: 2.25vmin;
	box-shadow: none;
}
.hand-bones .bone:after,
.big-bones:after {
	top: 0.125vmin;
}

.hand-bones .bone:nth-child(1) {
	transform: rotate(5deg) translateY(-1vmin) translateX(0.15vmin);
	filter: drop-shadow(-3vmin 0vmin 0px var(--bone));
}
.hand-bones .bone:nth-child(2) {
	transform: rotate(0deg) translateX(0.5vmin);
	filter: drop-shadow(-3vmin 0vmin 0px var(--bone));
}
.hand-bones .bone:nth-child(3) {
	transform: rotate(-2deg) translateY(1.15vmin) translateX(0.5vmin);
	filter: drop-shadow(-3vmin 0vmin 0px var(--bone));
}
.hand-bones .bone:nth-child(4) {
	transform: rotate(-5deg) translateY(2.3vmin) translateX(0.5vmin);
	filter: drop-shadow(-3vmin 0vmin 0px var(--bone));
}

.big-bones {
	background: var(--bone);
	height: 1vmin !important;
	position: absolute;
	left: 18.75vmin !important;
	top: 0.85vmin;
	z-index: 1;
	filter: var(--sdw-flt);
	transform: rotate(180deg);
}

label[for=btn]:before,
label[for=btn]:after{
	--on: #121212;
	font-family: 'Nanum Pen Script', cursive;
	font-size: 7vmin;
	content: "TRICK";
	color: #e6e6e6;
	position: absolute;
	width: 50%;
	height: 100%;
	display: flex;
	align-items: center;
	justify-content: center;
	z-index: 0;
	text-shadow: 1px 1px 1px var(--on), -1px 1px 1px var(--on), 1px -1px 1px var(--on), -1px -1px 1px var(--on), 0px 3px 3px #000c;
}

label[for=btn]:after {
	content: "TREAT";
	left: 50%;
	color: #ff5907;
	z-index: -1;
	filter: brightness(2) contrast(1.5);

}

/*
.thumb * {
max-width: 0;
left: 0;
overflow: hidden;
width: 100%;
height: 100%;
position: absolute;
bottom: 0vmin;
transition: max-width 0.5s ease-in-out 0.5s;
}

#btn:checked + label .thumb * {
max-width: 100%;
}
*/

.thumb,
#btn:checked + label .thumb {
	background: #fff0 !important;
}

#btn:checked + label .thumb {

}

.trick {
	max-width: 0;
	left: 0;
	overflow: hidden;
	width: 100%;
	height: 100%;
	position: absolute;
	bottom: 0vmin;
	transition: max-width 0.5s ease-in-out 0.5s;
	background-color: #ececec;
	mix-blend-mode: screen;
	z-index: 1;
}

#btn:checked + label .thumb .trick {
	max-width: 100%;
}

.treat {
	max-width: 100%;
	right: 0;
	overflow: hidden;
	width: 100%;
	height: 100%;
	position: absolute;  
	bottom: 0vmin;
	transition: max-width 0.5s ease-in-out 0.5s;
	background: linear-gradient(0deg, #212121, #474747);
	z-index: 2;
	animation: candy-start 1s ease-in-out 0s 1;
}

@keyframes candy-start {
	0%, 50% { max-width: 100%; }
	100% { max-width: 0%; }
}

#btn:checked + label .thumb .treat {
	max-width: 0%;
}

.treat:before, .treat:after {
	content: "";
	--orange: #ffb837 0 50%, #fff0 calc(50% + 1px) 200%;
	--red: #ff3232 0 50%, #fff0 calc(50% + 1px) 200%;
	position: absolute;
	width: 100%;
	height: 100%;
	background: radial-gradient(circle at 100% 100%, var(--orange)), radial-gradient(circle at 100% 50%, var(--red)), radial-gradient(circle at 100% 0%, var(--orange)), radial-gradient(circle at 50% 0%, var(--red)), radial-gradient(circle at 0% 0%, var(--orange)), radial-gradient(circle at 0% 50%, var(--red));
	box-shadow: 0.5vmin 0.5vmin 1vmin 0.5vmin #fff8 inset;
	/*border-radius: 100%;*/
}

.treat:after {
	clip-path: polygon(0 0, 100% 0, 100% 10%, 0 89%);
	transform: rotate(180deg);
}

.eyes:before,
.eyes:after{
	content: "";
	position: absolute;
	top: 2vmin;
	left: 2.75vmin;
	width: 5.25vmin;
	height: 7vmin;
	background: #18202d;
	border-radius: 100% 60% 65% 65% / 100% 100% 55% 55%;
	transform: rotate(15deg);
	box-shadow: 1vmin 1vmin 1vmin 0 #000c inset, -0.05vmin -0.5vmin 0.5vmin #0008, 0.5vmin 0.5vmin 1vmin 0 #fff8 inset, 0vmin 0.5vmin 1vmin 0 #0008;
}

.eyes:after {
	left: 9.5vmin;
	border-radius: 65% 100% 65% 65% / 100% 100% 55% 55%;
	transform: rotate(-14deg);
}

.nose {
	filter: drop-shadow(0.1vmin 0.2vmin 0.3vmin #fff) drop-shadow(0.1vmin 0.5vmin 1vmin #000);
}

.nose:before,
.nose:after {
	content: "";
	position: absolute;
	width: 0.75vmin;
	height: 1.65vmin;
	background: #333;
	border-radius: 100% 60% 65% 65% / 100% 100% 55% 55%;
	transform: rotate(25deg);
	left: 7.75vmin;
	top: 9vmin;
}

.nose:after {
	width: 0.85vmin;
	height: 1.75vmin;
	transform: rotate(-22deg);
	margin-left: 1.25vmin;
}

.mouth {
	background: radial-gradient(circle at 9vmin 1.5vmin, #fff0 13vmin, #333 calc(13vmin + 1px) 13.25vmin, #fff0 calc(13.25vmin + 1px) 100%), radial-gradient(circle at 9vmin 0.5vmin, #fff0 14vmin, #333 calc(14vmin + 1px) 14.25vmin, #fff0 calc(14.25vmin + 1px) 100%), radial-gradient(circle at 9vmin calc(0.5vmin - 1px), #fff0 14vmin, #333 calc(14vmin + 1px) 14.25vmin, #fff0 calc(14.25vmin + 1px) 100%);
	width: 100%;
	height: 100%;
	position: absolute;
	bottom: 0vmin;
	filter: drop-shadow(0.1vmin 0.2vmin 0.3vmin #fff) drop-shadow(0.1vmin 0.5vmin 1vmin #000);
}

.mouth:before,
.mouth:after {
	--line: #fff0 0 1vmin, #333 calc(1vmin + 2px), #fff0 calc(1vmin + 3px) 100%;
	content: "";
	position: absolute;
	width: 100%;
	height: 5vmin;
	background: linear-gradient(-68deg, var(--line)), linear-gradient(-78deg, var(--line)), linear-gradient(-81deg, var(--line)), linear-gradient(-86deg, var(--line)), linear-gradient(-97deg, var(--line)), linear-gradient(-84deg, var(--line)), linear-gradient(-106deg, var(--line)), linear-gradient(-97deg, var(--line)), linear-gradient(-105deg, var(--line)), linear-gradient(-118deg, var(--line));
	bottom: 2vmin;
	/* border-radius: 50% 50% 200% 200%; */
	background-size: 1.5vmin 1.25vmin, 1.5vmin 1.75vmin, 1.5vmin 1.75vmin, 1.5vmin 2.75vmin, 1.25vmin 2.25vmin, 1.5vmin 2.5vmin, 1.5vmin 1.75vmin, 1.85vmin 1.75vmin, 1.85vmin 1.35vmin, 1.85vmin 1.1vmin;
	background-repeat: no-repeat;
	background-position: 1vmin 1.1vmin, 2.5vmin 1.75vmin, 4.25vmin 2.5vmin, 6.25vmin 2.65vmin, 8.25vmin 2.95vmin, 9.85vmin 2.75vmin, 11.25vmin 2.85vmin, 12.55vmin 2.5vmin, 13.85vmin 2.15vmin, 15.05vmin 1.65vmin;
}

.mouth:after {
	transform: rotateZ(0deg) rotateY(12deg);
}

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