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HTML

              
                <button class="button" type="button">
	<span class="print print--under">
		<svg viewBox="0 0 98 109" xmlns="http://www.w3.org/2000/svg">
			<path d="m95.42 60.221c0.33333-4.6667 0.33333-10.667 0-18-0.5-11-8.5-26.5-24-34.5-15.5-8-38-9.5-55.5 8-11.667 11.667-16 25.5-13 41.5l0.65525 4.3683c0.38693 2.5791 2.7914 4.3563 5.3705 3.9695 2.5664-0.38496 4.3413-2.7687 3.9742-5.3378-1-7-6-22 10-38 14.554-14.554 38.15-14.554 52.704 0 4.5444 4.5444 7.8364 10.187 9.5562 16.379 0.5744 2.0681 0.98766 3.9417 1.2398 5.6209 2.4899 16.582-2.9979 37.051-6 53" pathLength="1"/>
			<path d="m15.42 76.221c5.3333-3.6667 7.3333-10.167 6-19.5-0.23862-1.551-0.44877-3.0902-0.63044-4.6174-1.8313-15.395 9.1641-29.359 24.559-31.191 1.268-0.15084 2.5448-0.21497 3.8216-0.19197 15.616 0.28138 28.07 13.129 27.864 28.747-0.089675 6.8105-0.29443 11.895-0.61426 15.253-1.2042 12.644-2.9364 21.532-7 37" pathLength="1"/>
			<path d="m19.92 85.221c7-5.3333 10.5-13.333 10.5-24v-12.5c0-10.217 8.2827-18.5 18.5-18.5 10.287 0 18.636 8.3235 18.666 18.611 0.019372 6.5699-0.035925 10.7-0.16589 12.389-1.5 19.5-3.5 31.5-12 45" pathLength="1"/>
			<path d="m26.92 92.221c8.6667-9.3333 13-17.333 13-24 0-4.1832-0.18166-10.365-0.54497-18.544-0.2219-4.9954 3.6478-9.2249 8.6432-9.4467 0.13383-0.0059444 0.26778-0.0089177 0.40175-0.0089177 5.5235 0 10.044 4.395 10.2 9.9163 0.16256 5.764-0.070756 11.792-0.69994 18.084-1.5 15-5.5 25.5-16.5 38" pathLength="1"/>
			<path d="m32.92 99.221c10.667-12.333 16-23.333 16-33v-17" pathLength="1"/>
		</svg>
	</span>
	<span class="print print--over">
		<svg viewBox="0 0 98 109" xmlns="http://www.w3.org/2000/svg">
			<path d="m95.42 60.221c0.33333-4.6667 0.33333-10.667 0-18-0.5-11-8.5-26.5-24-34.5-15.5-8-38-9.5-55.5 8-11.667 11.667-16 25.5-13 41.5l0.65525 4.3683c0.38693 2.5791 2.7914 4.3563 5.3705 3.9695 2.5664-0.38496 4.3413-2.7687 3.9742-5.3378-1-7-6-22 10-38 14.554-14.554 38.15-14.554 52.704 0 4.5444 4.5444 7.8364 10.187 9.5562 16.379 0.5744 2.0681 0.98766 3.9417 1.2398 5.6209 2.4899 16.582-2.9979 37.051-6 53" pathLength="1"/>
			<path d="m15.42 76.221c5.3333-3.6667 7.3333-10.167 6-19.5-0.23862-1.551-0.44877-3.0902-0.63044-4.6174-1.8313-15.395 9.1641-29.359 24.559-31.191 1.268-0.15084 2.5448-0.21497 3.8216-0.19197 15.616 0.28138 28.07 13.129 27.864 28.747-0.089675 6.8105-0.29443 11.895-0.61426 15.253-1.2042 12.644-2.9364 21.532-7 37" pathLength="1"/>
			<path d="m19.92 85.221c7-5.3333 10.5-13.333 10.5-24v-12.5c0-10.217 8.2827-18.5 18.5-18.5 10.287 0 18.636 8.3235 18.666 18.611 0.019372 6.5699-0.035925 10.7-0.16589 12.389-1.5 19.5-3.5 31.5-12 45" pathLength="1"/>
			<path d="m26.92 92.221c8.6667-9.3333 13-17.333 13-24 0-4.1832-0.18166-10.365-0.54497-18.544-0.2219-4.9954 3.6478-9.2249 8.6432-9.4467 0.13383-0.0059444 0.26778-0.0089177 0.40175-0.0089177 5.5235 0 10.044 4.395 10.2 9.9163 0.16256 5.764-0.070756 11.792-0.69994 18.084-1.5 15-5.5 25.5-16.5 38" pathLength="1"/>
			<path d="m32.92 99.221c10.667-12.333 16-23.333 16-33v-17" pathLength="1"/>
		</svg>
	</span>
</button>

              
            
!

CSS

              
                $size: 30vmin;
$baseColor: #d8dee8;
$accent: blue;
$ease: cubic-bezier(.33,.45,.3,1);

@mixin full($unit) {
	position: absolute;
	top: $unit;
	right: $unit;
	bottom: $unit;
	left: $unit;
}

@function accent-from($i) {
	@return adjust-hue(lighten($accent, 10), -35deg + (2deg * (5 - $i)));
}

@function accent-to($i) {
	@return adjust-hue($accent, 10deg + (4deg * ($i - 1)));
}

$accentTo: rgba(accent-to(5), .66);

$baseColor: 
	if(
		lightness($baseColor) > 80,
		$baseColor,
		lighten($baseColor, 80 - lightness($baseColor))
	);

body {
	position: absolute;
	height: 100%;
	width: 100%;
	display: flex;
	align-items: center;
	justify-content: center;
	background: $baseColor;
	
	&:before {
		content: '';
		position: absolute;
		width: 100%;
		height: 100%;
		background: radial-gradient(150% 150% at 0% 20%, lighten($baseColor, 0) 20%, darken($baseColor, 30));
	}
}

.button {
	appearance: none;
	border: none;
	outline: none;
	padding: 0;
	border: 0;
	
	cursor: pointer;
	
	display: flex;
	align-items: center;
	justify-content: center;
	
	position: relative;
	
	font-size: $size;
	width: 1em;
	height: 1em;
	
	opacity: 0;
	animation: buttonIn 2s $ease forwards 2s;
	
	@keyframes buttonIn {
		from {
			opacity: 0;
			transform: scale3d(1.1,1.15,1);
		}
		to {
			opacity: 1;
			transform: none;
		}
	}
	
	background: none;
	
	border-radius: 50%;
	
	&:before,
	&:after {
		content: '';
		border-radius: inherit;
	}
		
	&:before {		
		filter: blur(.025em);
		@include full(0);
	
		// $baseColor: red;
		background:
			radial-gradient(160% 160% at 57.5% 60%, rgba(lighten($baseColor, 6), 0) 30%, lighten($baseColor, 6) 45%), // light top left
			radial-gradient(180% 200% at 40% 17.5%, rgba(darken($baseColor, 20), 0) 35%, darken($baseColor,20) 50%), // dark bottom right
			radial-gradient(120% 120% at 45% 45%, rgba(darken($baseColor, 10), 0) 42%, rgba(darken($baseColor,20),.75) 50%), // darker small bottom right
			;
		background-color: darken($baseColor,8.66);

		box-shadow:
			inset -.05em -.05em .025em -.025em darken($baseColor,15),
			.115em .15em .1em -.033em darken(adjust-hue($baseColor,-2.5deg), 20), // dark close
			.15em .2em .25em darken($baseColor, 15), // dark far
			.5em .33em .5em .1em darken($baseColor, 15), // dark furthest
			-.1em -.1em .05em -.075em lighten($baseColor, 2), // light close
			-.2em -.2em .33em -.075em lighten($baseColor, .5), // light far
		;
	}
	
	&:after {
		@include full(.025em);
		background: 
			radial-gradient(150% 150% at 75% 75%, rgba(darken($baseColor, 30),0) 30%, darken($baseColor, 30)), // dark top left
			radial-gradient(150% 150% at -10% -10%, rgba(lighten($baseColor, 3),0) 50%, lighten($baseColor, 3)) // light bottom left
		;
		background-color: darken($baseColor, 10);
		transition: .75s $ease;
		transition-delay: .25s;
		opacity: 0;
		filter: blur(.03em);
		transform: scale3d(.925,.94,1);
	}
}

.print {
	$size: 40%;
	position: relative;
	width: $size;
	height: 0;
	padding-bottom: $size * 1.1122;
	display: inline-block;
	z-index: 1;
	transform: scale3d(1.05, 1.05, 1);
	backface-visiblity: hidden;
	
	color: rgba(accent-from(5), .5);
	
	svg {
		position: absolute;
		top: 0;
		right: 0;
		bottom: 0;
		left: 0;
	}
	
	path {
		stroke-width: 4;
		fill: none;
		stroke-linecap: round;
		stroke-dasharray: 1;
		transition: 2s $ease;
		will-change: stroke-dashoffset, stroke, color, opacity;
	}
	
	$glow: lighten($accent, 85 - lightness($accent));
	
	&--under {
		margin-right: -40%;
		mix-blend-mode: lighten;
		filter: drop-shadow(0 0 .033em currentColor);

		// opacity: 0;
		stroke-dashoffset: .5;
		transition: 2s $ease;
		animation: printPulse 2s linear infinite 6.25s;
		
		@keyframes printPulse {
			0% { opacity: 1 }
			50% { opacity: .33 }
			100% { opacity: 1 }
		}
		
		path {
			opacity: 0;
			animation: printIn 2s $ease forwards 3.2s;
			
			@keyframes printIn {
				from {
					opacity: 0;
					stroke-dashoffset: .5;
				}
				to {
					opacity: 1;
					stroke-dashoffset: 0;
				}
			}
			
			@for $i from 1 through 5 {
				&:nth-of-type(#{$i}) {
					stroke: lighten(accent-from($i), 22.5);
				}
			}	
		}
	}
	
	&--over {
		filter:
			drop-shadow(-0.0075em -0.0075em 0.005em rgba(0, 0, 51, 0.1)) // dark bevel
			drop-shadow(0.0075em 0.0075em 0.005em rgba(255, 255, 255,.25)) // light bevel
			drop-shadow(0 0 0.04em currentColor) // glow
		;
		opacity: 0;
		transition:
			transform 2s $ease,
			color 0s .4s,
			opacity .5s $ease,
		;
					
		&:after {
			content: '';
			position: absolute;
			top: -40%;
			right: -60%;
			bottom: -40%;
			left: -60%;
			border-radius: 50%;
			opacity: 0;
			background:
				// radial-gradient(32.5% 32.5% at 52.5% 52.5%, rgba(darken($accentTo, 45), .05), rgba(darken($accentTo, 15), 0)),
				radial-gradient(32.5% 32.5% at 42.5% 42.5%, rgba(white, .55), rgba(white, 0)),
			;
			mix-blend-mode: color-dodge;
			
			transition: opacity .3s $ease;
			animation:
				glowPulse 3s linear infinite,
				glowTwist 3s linear infinite
			;
			
			@keyframes glowPulse {
				0% { transform: scale3d(.9,.9,1) }
				50% { transform: scale3d(1,1,1) }
				100% { transform: scale3d(.9,.9,1) }
			}
						
			@keyframes glowTwist {
				0% { rotate: 0deg }
				50% { rotate: 180deg }
				100% { rotate: 360deg }
			}
		}
		
		path {
			opacity: 0;
			stroke-dashoffset: 1;
			transition:
				stroke .5s $ease,
				opacity 0s .5s,
				stroke-dashoffset 0s .5s
			;
			
			
			@for $i from 1 through 5 {
				&:nth-of-type(#{$i}) {
					stroke: accent-from($i);
				}
			}
		} 
	}
}

.button:hover,
.button.test {
	
	&.test {
		animation: none;
		opacity: 1;
		transform: none;
		font-size: 60vmin;
	}
	
	&:after {
		opacity: 1;
		transform: none;
		transition-delay: 0s;
	}
	
	.print {
		transform: scale3d(1,1,1) translateZ(0);
		
		&--over {
			color: $accentTo;
			opacity: .66;
			transition:
				1.5s $ease 4.5s,
				opacity .25s $ease,
				transform 2s $ease,
			;
			
			&:after {
				// opacity: 1;
				transition: opacity 2s $ease 5.25s;
			}
			
			path {
				opacity: 1;
				stroke-dashoffset: 0;
						
				@for $i from 1 through 5 {
					&:nth-of-type(#{$i}) {
						$delay: .25s + (.1s * $i);
						stroke: accent-to($i);
						transition:
							opacity .25s $ease $delay,
							stroke-dashoffset 4s + (.2s * $i) $ease $delay,
							stroke 1s + (.2s * $i) $ease 1.75s + (.1s * (5 - $i)) + 2.5,
							color 1s + (.2s * $i) $ease 1.75s + (.1s * (5 - $i)) + 2.5
						;
					}
				}
			}
		}
	}
}
              
            
!

JS

              
                // Thanks to Voicu Apostol for the beaut inspo: https://dribbble.com/shots/9552931-3D-Fingerprint-Scanner 🔥❤️🙏
              
            
!
999px

Console