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HTML

              
                <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>

<div id="background"></div>

<div id="day"></div>
<div id="night"></div>

<svg version="1.1" id="darkmode" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
	 width="369px" height="171.667px" viewBox="0 0 369 171.667" enable-background="new 0 0 369 171.667" xml:space="preserve">
<g>
	<polygon class="star" id="star-1" fill="#A2B5BF" points="166.253,132.982 164.364,135.676 160.983,136.488 163.196,138.965 162.996,142.16 
		166.253,140.998 169.509,142.16 169.309,138.965 171.522,136.488 168.142,135.676 	"/>
	<polygon class="star" id="star-2" fill="#A2B5BF" points="175.522,44.243 172.684,48.29 167.603,49.51 170.929,53.233 170.628,58.035 
		175.522,56.288 180.417,58.035 180.116,53.233 183.442,49.51 178.361,48.29 	"/>
	<polygon class="star" id="star-3" fill="#A2B5BF" points="208.22,91.845 206.083,94.891 202.259,95.81 204.763,98.61 204.535,102.226 
		208.22,100.911 211.903,102.226 211.677,98.61 214.181,95.81 210.356,94.891 	"/>
	<polygon class="star" id="star-4" fill="#A2B5BF" points="252.545,39.052 250.409,42.098 246.585,43.017 249.089,45.819 248.86,49.433 
		252.545,48.118 256.229,49.433 256.002,45.819 258.506,43.017 254.682,42.098 	"/>
	<polygon class="star" id="star-5" fill="#A2B5BF" points="280.151,84.949 282.749,88.997 287.401,90.217 284.355,93.94 284.632,98.742 
		280.151,96.995 275.669,98.742 275.946,93.94 272.899,90.217 277.552,88.997 	"/>
	<polygon class="star" id="star-6" fill="#A2B5BF" points="249.791,124.466 246.668,128.919 241.076,130.261 244.737,134.356 244.405,139.64 
		249.791,137.718 255.178,139.64 254.845,134.356 258.506,130.261 252.914,128.919 	"/>
	<g id="moon">
		<g>
			<g>
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			</g>
		</g>
		<path fill="#A2B5BF" d="M295.264,35.35c8.768,10.972,14.013,24.881,14.013,40.017c0,35.43-28.723,64.153-64.153,64.153
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			C319.815,65.339,310.213,47.096,295.264,35.35z"/>
		<circle fill="#CAD9DD" cx="304.291" cy="98.701" r="5.392"/>
		<path fill="#CAD9DD" d="M278.364,126.115c0-8.791-7.127-15.916-15.918-15.916s-15.918,7.125-15.918,15.916
			c0,8.793,7.127,15.92,15.918,15.92S278.364,134.908,278.364,126.115z"/>
		<circle fill="#CAD9DD" cx="242.372" cy="138.547" r="3.603"/>
		<circle fill="#CAD9DD" cx="306.504" cy="57.724" r="3.456"/>
		<g>
			<circle fill="#A2B5BF" cx="262.446" cy="126.115" r="14.346"/>
			<path opacity="0.12" fill="#231F20" d="M249.772,128.002c0-7.922,6.422-14.346,14.346-14.346c3.824,0,7.297,1.5,9.869,3.941
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		</g>
		<g>
			<circle fill="#A2B5BF" cx="239.621" cy="65.064" r="9.908"/>
			<path opacity="0.12" fill="#231F20" d="M230.867,66.366c0-5.472,4.437-9.907,9.908-9.907c2.642,0,5.04,1.036,6.816,2.721
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		<g>
			<circle fill="#A2B5BF" cx="292.418" cy="64.686" r="7.339"/>
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		<g>
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		<g>
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		<g>
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		<g>
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		<g>
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				c-0.502-0.678-1.307-1.117-2.214-1.117c-1.52,0-2.751,1.231-2.751,2.751c0,0.786,0.33,1.494,0.858,1.996
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		<g>
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		<g>
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		<g>
			<circle fill="#A2B5BF" cx="306.504" cy="57.724" r="2.751"/>
			<path opacity="0.12" fill="#231F20" d="M304.073,58.085c0-1.519,1.231-2.751,2.751-2.751c0.733,0,1.399,0.288,1.894,0.756
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		</g>
		<g>
			<circle fill="#A2B5BF" cx="207.412" cy="62.199" r="2.751"/>
			<path opacity="0.12" fill="#231F20" d="M204.981,62.56c0-1.52,1.232-2.751,2.752-2.751c0.733,0,1.398,0.287,1.893,0.755
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		<g>
			<circle fill="#A2B5BF" cx="214.279" cy="103.596" r="2.751"/>
			<path opacity="0.12" fill="#231F20" d="M211.848,103.958c0-1.52,1.231-2.751,2.751-2.751c0.734,0,1.4,0.287,1.893,0.755
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		</g>
	</g>
</g>
<g>
	<g id="sun">
		<g>
			<g>
				<path fill="#F4E962" d="M255.661,153.638c-18.113,0-35.144-7.054-47.951-19.862c-12.809-12.808-19.862-29.838-19.862-47.951
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				<path fill="#F9C941" d="M255.661,21.671c35.431,0,64.153,28.722,64.153,64.153s-28.723,64.153-64.153,64.153
					s-64.153-28.723-64.153-64.153S220.23,21.671,255.661,21.671 M255.661,14.35c-9.646,0-19.007,1.891-27.823,5.62
					c-8.512,3.601-16.154,8.753-22.717,15.314c-6.562,6.562-11.714,14.205-15.314,22.717c-3.729,8.816-5.62,18.178-5.62,27.823
					s1.891,19.007,5.62,27.823c3.601,8.512,8.753,16.155,15.314,22.717c6.563,6.562,14.205,11.714,22.717,15.314
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					L255.661,14.35z"/>
			</g>
		</g>
	</g>
	<path id="cloud" fill="#ECF0F1" stroke="#CAD4D8" stroke-width="6" stroke-miterlimit="10" d="M153.269,109.614h2.813
		c-1.348-2.84-2.124-6.003-2.124-9.354c0-12.083,9.794-21.878,21.877-21.878c7.872,0,14.751,4.172,18.605,10.411
		c2.121-1.246,4.583-1.974,7.221-1.974c7.889,0,14.285,6.396,14.285,14.285c0,2.1-0.465,4.087-1.277,5.882h6.354
		c6.604,0,12.007,5.403,12.007,12.007s-5.403,12.006-12.007,12.006h-25.151H179.48h-26.212c-5.881,0-10.692-4.812-10.692-10.692
		S147.388,109.614,153.269,109.614z"/>
</g>
</svg>
              
            
!

CSS

              
                body {
  margin: 0;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

svg {
  transform: scale(.7);
  z-index: 2;
  pointer-events: none;
}

#day, #night {
  width: 240px;
  height: 110px;
  background: white;
  position: absolute;
  z-index: 1;
  cursor: pointer;
  border-radius: 100px;
  background: #9cd6ef;
  border: 6px solid #65c0e7;
}

#night {
  pointer-events: none;
}

#background {
  width: 100%;
  height: 100vh;
  position: absolute;
  background: #d3edf8;
  z-index: -1;
}

@media (max-width: 720px) {
  #day, #night {
    width: 320px;
    height: 150px;
  }
  svg {
    transform: scale(.95);
  }
}
              
            
!

JS

              
                gsap.set("#moon, .star", {opacity: 0});
gsap.set("#sun, #cloud, #moon", {x: 15});
gsap.set(".star", {x: 35, y: -5});

$("#day").click(function(){
  gsap.to("#sun", 1, {x: -157, opacity: 0, ease: Power1.easeInOut});
  gsap.to("#cloud", .5, {opacity: 0, ease: Power1.easeInOut});
  gsap.to("#moon", 1, {x: -157, rotate: -360, transformOrigin: "center", opacity: 1, ease: Power1.easeInOut});
  gsap.to(".star", .5, {opacity: 1, ease: Power1.easeInOut});
  gsap.to("#night", 1, {background: "#224f6d", borderColor: "#cad4d8", ease: Power1.easeInOut});
  gsap.to("#background", 1, {background: "#0d1f2b", ease: Power1.easeInOut});
  $(this).css({"pointer-events": "none"});
  
  setTimeout(function(){
    $("#night").css({"pointer-events": "all"})
  }, 1000);
});

$("#night").click(function(){
  gsap.to("#sun", 1, {x: 15, opacity: 1, ease: Power1.easeInOut});
  gsap.to("#cloud", 1, {opacity: 1, ease: Power1.easeInOut});
  gsap.to("#moon", 1, {opacity: 0, x: 35, rotate: 360, transformOrigin: "center", ease: Power1.easeInOut});
  gsap.to(".star", 1, {opacity: 0, ease: Power1.easeInOut});
  gsap.to("#night", 1, {background: "#9cd6ef", borderColor: "#65c0e7", ease: Power1.easeInOut});
  gsap.to("#background", 1, {background: "#d3edf8", ease: Power1.easeInOut});
  $(this).css({"pointer-events": "none"});
  
  setTimeout(function(){
    $("#day").css({"pointer-events": "all"})
  }, 1000);
});


              
            
!
999px

Console