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HTML

              
                <div class="snow"></div>
              
            
!

CSS

              
                html {
	 height: 100%;
	 background: linear-gradient(#321 30%, #667);
	 overflow: hidden;
}
 .snow, .snow:before, .snow:after {
	 position: absolute;
	 top: -400px;
	 left: 0;
	 bottom: 0;
	 right: 0;
	 background-image: radial-gradient(4px 4px at 379px 102px, rgba(255, 255, 255, 0.9) 50%, rgba(0, 0, 0, 0)), radial-gradient(3px 3px at 212px 309px, rgba(255, 255, 255, 0.6) 50%, rgba(0, 0, 0, 0)), radial-gradient(4px 4px at 311px 147px, rgba(255, 255, 255, 0.9) 50%, rgba(0, 0, 0, 0)), radial-gradient(3px 3px at 131px 234px, rgba(255, 255, 255, 0.7) 50%, rgba(0, 0, 0, 0)), radial-gradient(3px 3px at 335px 63px, rgba(255, 255, 255, 0.7) 50%, rgba(0, 0, 0, 0)), radial-gradient(5px 5px at 184px 253px, rgba(255, 255, 255, 0.7) 50%, rgba(0, 0, 0, 0)), radial-gradient(4px 4px at 371px 33px, rgba(255, 255, 255, 0.6) 50%, rgba(0, 0, 0, 0)), radial-gradient(6px 6px at 181px 280px, rgba(255, 255, 255, 0.7) 50%, rgba(0, 0, 0, 0)), radial-gradient(5px 5px at 380px 91px, rgba(255, 255, 255, 0.6) 50%, rgba(0, 0, 0, 0)), radial-gradient(4px 4px at 390px 359px, rgba(255, 255, 255, 1) 50%, rgba(0, 0, 0, 0)), radial-gradient(4px 4px at 57px 259px, rgba(255, 255, 255, 0.8) 50%, rgba(0, 0, 0, 0)), radial-gradient(5px 5px at 184px 128px, rgba(255, 255, 255, 0.8) 50%, rgba(0, 0, 0, 0)), radial-gradient(3px 3px at 348px 158px, rgba(255, 255, 255, 0.9) 50%, rgba(0, 0, 0, 0)), radial-gradient(5px 5px at 362px 285px, rgba(255, 255, 255, 0.6) 50%, rgba(0, 0, 0, 0)), radial-gradient(5px 5px at 242px 22px, rgba(255, 255, 255, 0.9) 50%, rgba(0, 0, 0, 0)), radial-gradient(6px 6px at 257px 163px, rgba(255, 255, 255, 0.6) 50%, rgba(0, 0, 0, 0)), radial-gradient(6px 6px at 21px 66px, rgba(255, 255, 255, 0.9) 50%, rgba(0, 0, 0, 0)), radial-gradient(4px 4px at 11px 298px, rgba(255, 255, 255, 1) 50%, rgba(0, 0, 0, 0)), radial-gradient(3px 3px at 24px 69px, rgba(255, 255, 255, 0.7) 50%, rgba(0, 0, 0, 0)), radial-gradient(3px 3px at 299px 53px, rgba(255, 255, 255, 0.7) 50%, rgba(0, 0, 0, 0)), radial-gradient(6px 6px at 256px 54px, rgba(255, 255, 255, 0.9) 50%, rgba(0, 0, 0, 0)), radial-gradient(4px 4px at 347px 275px, rgba(255, 255, 255, 0.7) 50%, rgba(0, 0, 0, 0)), radial-gradient(6px 6px at 283px 193px, rgba(255, 255, 255, 0.6) 50%, rgba(0, 0, 0, 0)), radial-gradient(5px 5px at 97px 193px, rgba(255, 255, 255, 0.7) 50%, rgba(0, 0, 0, 0)), radial-gradient(5px 5px at 91px 53px, rgba(255, 255, 255, 0.6) 50%, rgba(0, 0, 0, 0)), radial-gradient(4px 4px at 309px 286px, rgba(255, 255, 255, 1) 50%, rgba(0, 0, 0, 0)), radial-gradient(5px 5px at 273px 213px, rgba(255, 255, 255, 1) 50%, rgba(0, 0, 0, 0)), radial-gradient(4px 4px at 306px 262px, rgba(255, 255, 255, 0.6) 50%, rgba(0, 0, 0, 0)), radial-gradient(3px 3px at 30px 199px, rgba(255, 255, 255, 1) 50%, rgba(0, 0, 0, 0)), radial-gradient(5px 5px at 50px 6px, rgba(255, 255, 255, 0.9) 50%, rgba(0, 0, 0, 0)), radial-gradient(6px 6px at 140px 259px, rgba(255, 255, 255, 0.7) 50%, rgba(0, 0, 0, 0)), radial-gradient(3px 3px at 63px 352px, rgba(255, 255, 255, 0.6) 50%, rgba(0, 0, 0, 0)), radial-gradient(3px 3px at 93px 189px, rgba(255, 255, 255, 0.8) 50%, rgba(0, 0, 0, 0)), radial-gradient(5px 5px at 22px 317px, rgba(255, 255, 255, 0.7) 50%, rgba(0, 0, 0, 0)), radial-gradient(3px 3px at 30px 186px, rgba(255, 255, 255, 0.7) 50%, rgba(0, 0, 0, 0)), radial-gradient(3px 3px at 121px 225px, rgba(255, 255, 255, 0.7) 50%, rgba(0, 0, 0, 0)), radial-gradient(5px 5px at 247px 66px, rgba(255, 255, 255, 0.8) 50%, rgba(0, 0, 0, 0)), radial-gradient(5px 5px at 111px 52px, rgba(255, 255, 255, 0.9) 50%, rgba(0, 0, 0, 0)), radial-gradient(5px 5px at 381px 10px, rgba(255, 255, 255, 0.7) 50%, rgba(0, 0, 0, 0)), radial-gradient(3px 3px at 339px 342px, rgba(255, 255, 255, 0.9) 50%, rgba(0, 0, 0, 0));
	 background-size: 400px 400px;
	 animation: snow 5s linear infinite;
	 content: "";
}
 .snow:after {
	 margin-left: -133.3333333333px;
	 opacity: 0.4;
	 animation-duration: 10s;
	 animation-direction: reverse;
	 filter: blur(3px);
}
 .snow:before {
	 animation-duration: 15s;
	 animation-direction: reverse;
	 margin-left: -200px;
	 opacity: 0.65;
	 filter: blur(1.5px);
}
 @keyframes snow {
	 to {
		 transform: translateY(400px);
	}
}
 
              
            
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JS

              
                
              
            
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