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HTML 

              
                <div class="toggle">
	<input type="checkbox" id="btn" checked>
	<label for="btn">
		<span class="thumb">
			<div class="cranium"></div>
			<div class="mouth"></div>
		</span>
		<span class="arm-wrapper">
			<span class="arm">
				<span class="bone"></span>
				<span class="bone"></span>
				<span class="hand">
					<span class="bone"></span>
					<span class="bone"></span>
					<span class="bone"></span>
					<span class="bone"></span>
				</span>
				<span class="big"></span>
			</span>
		</span>
	</label>
</div>
!

CSS 

              
                :root {
  --sz: 10vmin;
  --ttf: ease-in-out;
  --bone: #888;
}	

*, *:before, *:after {
  box-sizing: border-box;
}

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% 50%, #444, #000);
}

.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: #141414;
  border-radius: var(--sz);
  overflow: hidden;
  box-shadow: 0 0 calc(var(--sz) / 50) calc(var(--sz) / 50) #000000, 0 0 calc(var(--sz) / 10) calc(var(--sz) / 50) #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(100% - calc(calc(var(--sz) * 2) - calc(var(--sz) / 3))) - calc(calc( var(--sz) / 10) + calc(var(--sz) / 10)));
  border-radius: var(--sz);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1;	
  animation: move-skull-left 0.5s var(--ttf) 0.5s;
  animation-fill-mode: forwards;
}

#btn:checked + label .thumb {
  left: calc(calc( var(--sz) / 10) + calc(var(--sz) / 50));
  animation: move-skull-right 0.5s var(--ttf) 0.5s;
  animation-fill-mode: forwards;
}

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

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

/*** Skull ***/

.thumb > * {
  position: absolute;
  animation: unselected 1.5s var(--ttf) 0s reverse;
  animation-fill-mode: forwards;
  filter: drop-shadow(0px 2px 2px #000);
}

#btn:checked + label .thumb * {
  animation: selected 1.5s var(--ttf) 0s;
  animation-fill-mode: forwards;	
}

@keyframes selected {
  0%, 50% {--bone: #888;}
  50%, 100% {--bone: #fff;}
}

@keyframes unselected {
  0%, 50% {--bone: #888;}
  50%, 100% {--bone: #fff;}
}

@supports (-moz-appearance:none) {
  .thumb > * {
    --bone: #888;
  } 
  #btn:checked + label .thumb * {
    --bone: #fff;
  }
}

.cranium {
  background: linear-gradient(180deg, var(--bone) 0 54%, #fff0 0 94%, var(--bone) 0 100%), radial-gradient(circle at 75% 69%, #fff0 0 1.75vmin, var(--bone) calc(1.75vmin + 1px) 4.85vmin, #fff0 calc(4.85vmin + 1px) 100%), radial-gradient(circle at 25% 69%, #fff0 0 1.75vmin, var(--bone) calc(1.75vmin + 1px) 4.85vmin, #fff0 calc(4.85vmin + 1px) 100%);
  width: 100%;
  height: 14vmin;
  left: 0;
  top: 0;
  border-radius: 10vmin 10vmin 5.5vmin 5.5vmin;
}

.cranium:before {
  content: "";
  position: absolute;
  width: 1.25vmin;
  height: 1.25vmin;
  bottom: -0.75vmin;
  left: 7.5vmin;
  background: var(--bone);
  border-radius: 100%;
  box-shadow: 1.25vmin 0 0 0 var(--bone);
}

.cranium:after {
  content: "";
  position: absolute;
  width: 5.25vmin;
  height: 1.5vmin;
  bottom: -0.95vmin;
  left: 6vmin;
  background: radial-gradient(circle at 90% 10%, var(--bone) 0 1vmin, #fff0 calc(1vmin + 1px) 100%), radial-gradient(circle at 10% 10%, var(--bone) 0 1vmin, #fff0 calc(1vmin + 1px) 100%);
  border-radius: 1vmin;
}

.mouth {
  border: 0.85vmin solid #fff0;
  border-bottom-color: var(--bone);
  width: 11.75vmin;
  left: 2.85vmin;
  height: 6vmin;
  top: 11.25vmin;
  background: radial-gradient(circle at 35% 98%, var(--bone) 0 0.65vmin, #fff0 calc(0.65vmin + 1px) 100%), radial-gradient(circle at 45% 100%, var(--bone) 0 0.65vmin, #fff0 calc(0.65vmin + 1px) 100%), radial-gradient(circle at 55% 100%, var(--bone) 0 0.65vmin, #fff0 calc(0.65vmin + 1px) 100%), radial-gradient(circle at 65% 98%, var(--bone) 0 0.65vmin, #fff0 calc(0.65vmin + 1px) 100%);
  background-repeat: no-repeat;
  border-radius: 100%;
}

.mouth:before, .mouth:after {
  content: "";
  position: absolute;
  border-radius: 100%;
  background: var(--bone);
  width: 0.7vmin;
  height: 0.7vmin;
  left: 0.4vmin;
  bottom: 0.25vmin;
}

.mouth:after {
  left: 9.05vmin;
}


/*** Arm ***/

@keyframes check-on {
  0% { right: -65%;}
  25%, 33% { right: 0%; }
  66%, 80% { right: -50%;  }
  100% { right: -65%;  }
}

@keyframes check-off {
  0% { right: -65%;}
  25%, 33% { right: 0%; }
  66%, 80% { right: -50%;  }
  100% { right: -65%;  }
}

.arm-wrapper {
  position: absolute;
  width: 100%;
  height: 100%;
  border-radius: 10vmin;
  overflow: hidden;
  right: -65%;
  animation: check-off 1.5s var(--ttf) 0s reverse;
  --bone: #fff;
}

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

.arm {
  position: absolute;
  width: 16vmin;
  height: 5vmin;
  right: 25%;
  right: 2%;
  top: calc(50% - 2.5vmin);
  border-radius: 0.25vmin;
}

.bone {
  background: var(--bone);
  width: 8vmin;
  height: 2vmin;
  position: absolute;
  transform: rotate(0deg);
  top: 1.5vmin;
  right: -4vmin;
}

.bone:before, .bone:after,
.big:before, .big: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 > .bone + .bone {
  top: 1.5vmin;
  left: 0.5vmin;
  height: 0.85vmin;
  width: 10.5vmin;
  box-shadow: 0 1.15vmin 0 0 var(--bone);
}
.arm > .bone + .bone:before, .arm > .bone + .bone:after {
  box-shadow: 10.15vmin 0 0 0 var(--bone);
}

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


/*** Hand ***/

.hand {
  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: -7vmin;
  z-index: 0;
}

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

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

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

.hand .bone:nth-child(2) {
  transform: rotate(0deg) translateX(0.5vmin);
  filter: drop-shadow(-3vmin 0vmin 0px var(--bone));
}

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

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

.big {
  background: var(--bone);
  height: 1vmin !important;
  position: absolute;
  left: -4.25vmin !important;
  top: 1.15vmin;
  z-index: 1;
  filter:drop-shadow(-2.5vmin 0vmin 0px var(--bone))  drop-shadow(0 0 1px #000) ;
}
!

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