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CSS

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CSS Base

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HTML 

              
                <div class="mobile-canvas">
	<h1>Nobody actually knows what they’re doing.</h1>
	<div class="button-container">
		<div class="button-wrapper">
			<div class="button">
				<span></span>
				<span></span>
				<span></span>
			</div>
			<div class="button-child-wrapper">
				<div class="button-child">

					<svg width="25px" height="25px" viewBox="0 0 25 25" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
    <!-- Generator: Sketch 50.2 (55047) - http://www.bohemiancoding.com/sketch -->
    <desc>Created with Sketch.</desc>
    <defs></defs>
    <g id="Page-1" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
        <g id="Artboard-3" transform="translate(-18.000000, -18.000000)" fill="#FC3E9F">
            <path d="M40.5353125,43 C39.17625,43 38.0703125,41.894375 38.0703125,40.535 L38.0703125,25.7421875 C38.0703125,25.3971875 38.3496875,25.1171875 38.6953125,25.1171875 C39.040625,25.1171875 39.3203125,25.3971875 39.3203125,25.7421875 L39.3203125,40.535 C39.3203125,41.205 39.8653125,41.75 40.5353125,41.75 C41.205,41.75 41.75,41.205 41.75,40.535 L41.75,20.4646875 C41.75,19.7946875 41.205,19.25 40.5353125,19.25 C39.8653125,19.25 39.3203125,19.7946875 39.3203125,20.4646875 L39.3203125,21.385 C39.3203125,21.7303125 39.040625,22.01 38.6953125,22.01 C38.3496875,22.01 38.0703125,21.7303125 38.0703125,21.385 L38.0703125,20.4646875 C38.0703125,19.105625 39.17625,18 40.5353125,18 C41.8946875,18 43,19.105625 43,20.4646875 L43,40.535 C43,41.894375 41.8946875,43 40.5353125,43 Z M33.8453125,43 C32.4859375,43 31.38,41.894375 31.38,40.535 L31.38,26.7146875 C31.38,25.355625 32.4859375,24.25 33.8453125,24.25 C35.2046875,24.25 36.31,25.355625 36.31,26.7146875 L36.31,40.535 C36.31,41.894375 35.2046875,43 33.8453125,43 Z M35.06,26.7146875 C35.06,26.0446875 34.515,25.5 33.8453125,25.5 C33.1753125,25.5 32.63,26.0446875 32.63,26.7146875 L32.63,40.535 C32.63,41.205 33.1753125,41.75 33.8453125,41.75 C34.515,41.75 35.06,41.205 35.06,40.535 L35.06,26.7146875 Z M27.1546875,43 C25.7953125,43 24.69,41.894375 24.69,40.535 L24.69,32.9646875 C24.69,31.605625 25.7953125,30.5 27.1546875,30.5 C28.5140625,30.5 29.62,31.605625 29.62,32.9646875 L29.62,40.535 C29.62,41.894375 28.5140625,43 27.1546875,43 Z M28.37,32.9646875 C28.37,32.2946875 27.8246875,31.75 27.1546875,31.75 C26.485,31.75 25.94,32.2946875 25.94,32.9646875 L25.94,40.535 C25.94,41.205 26.485,41.75 27.1546875,41.75 C27.8246875,41.75 28.37,41.205 28.37,40.535 L28.37,32.9646875 Z M20.4646875,43 C19.1053125,43 18,41.894375 18,40.535 L18,39.2146875 C18,37.855625 19.1053125,36.75 20.4646875,36.75 C21.82375,36.75 22.9296875,37.855625 22.9296875,39.2146875 L22.9296875,40.535 C22.9296875,41.894375 21.82375,43 20.4646875,43 Z M21.6796875,39.2146875 C21.6796875,38.5446875 21.1346875,38 20.4646875,38 C19.795,38 19.25,38.5446875 19.25,39.2146875 L19.25,40.535 C19.25,41.205 19.795,41.75 20.4646875,41.75 C21.1346875,41.75 21.6796875,41.205 21.6796875,40.535 L21.6796875,39.2146875 Z" id="Shape"></path>
            <filter x="-36.0%" y="-36.0%" width="172.0%" height="172.0%" filterUnits="objectBoundingBox" id="filter-2">
            <feMorphology radius="0.5" operator="dilate" in="SourceAlpha" result="shadowSpreadOuter1"></feMorphology>
            <feOffset dx="0" dy="0" in="shadowSpreadOuter1" result="shadowOffsetOuter1"></feOffset>
            <feGaussianBlur stdDeviation="2.5" in="shadowOffsetOuter1" result="shadowBlurOuter1"></feGaussianBlur>
            <feColorMatrix values="0 0 0 0 0.988235294   0 0 0 0 0.243137255   0 0 0 0 0.623529412  0 0 0 0.630859375 0" type="matrix" in="shadowBlurOuter1"></feColorMatrix>
        </filter>
        </g>
    </g>
</svg>
				</div>
				<div class="button-child">

					<svg width="25px" height="25px" viewBox="0 0 25 25" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
    <!-- Generator: Sketch 50.2 (55047) - http://www.bohemiancoding.com/sketch -->
    <desc>Created with Sketch.</desc>
    <defs></defs>
    <g id="Page-1" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
        <g id="Artboard-3-Copy" transform="translate(-18.000000, -18.000000)" fill="#FC3E9F">
            <path d="M40.3415158,38.3323418 L39.2478752,38.3323418 L39.2478752,40.8217803 C39.2478752,42.0229102 38.2667233,43 37.0605939,43 C35.8544646,43 34.8733127,42.0229102 34.8733127,40.8217803 L34.8733127,34.5983402 C34.8733127,33.3968978 35.8544646,32.419808 37.0605939,32.419808 C38.2667233,32.419808 39.2478752,33.3968978 39.2478752,34.5983402 L39.2478752,37.0877787 L40.3415158,37.0877787 C41.1164384,37.0877787 41.7476252,36.4590916 41.7476252,35.6872938 L41.7476252,30.4471928 C41.7476252,24.2671858 36.7043796,19.244563 30.4987501,19.244563 C28.6864314,19.244563 26.8928607,19.6801445 25.2992701,20.5144361 C24.9930507,20.6700455 24.6118388,20.5516198 24.4556044,20.2466503 C24.2931207,19.9416808 24.4118588,19.5682807 24.7180782,19.4064219 C26.4866513,18.4855764 28.4864514,18 30.4987501,18 C37.3918108,18 42.9975002,23.5825667 42.9975002,30.4471928 L42.9975002,35.6872938 C42.9975002,37.1437106 41.8038696,38.3323418 40.3415158,38.3323418 Z M37.9980002,34.5983402 C37.9980002,34.0815168 37.5792921,33.6646835 37.0605939,33.6646835 C36.5418958,33.6646835 36.1231877,34.0815168 36.1231877,34.5983402 L36.1231877,40.8217803 C36.1231877,41.3382912 36.5418958,41.755437 37.0605939,41.755437 C37.5792921,41.755437 37.9980002,41.3382912 37.9980002,40.8217803 L37.9980002,34.5983402 Z M26.1241876,34.5983402 L26.1241876,40.8217803 C26.1241876,42.0229102 25.1430357,43 23.9369063,43 C22.7307769,43 21.749625,42.0229102 21.749625,40.8217803 L21.749625,38.3323418 L20.6559844,38.3323418 C19.1936306,38.3323418 18,37.1437106 18,35.6872938 L18,30.4471928 C18,27.8083942 18.8186681,25.2877087 20.3622638,23.1594841 C20.5684932,22.8791996 20.9559544,22.8232677 21.2371763,23.0223103 C21.5183982,23.2216653 21.5808919,23.6135011 21.3746625,23.8875362 C19.9873013,25.8042196 19.249875,28.0758674 19.249875,30.4471928 L19.249875,35.6872938 C19.249875,36.4590916 19.8810619,37.0877787 20.6559844,37.0877787 L21.749625,37.0877787 L21.749625,34.5983402 C21.749625,33.3968978 22.7307769,32.419808 23.9369063,32.419808 C25.1430357,32.419808 26.1241876,33.3968978 26.1241876,34.5983402 Z M24.8743126,34.5983402 C24.8743126,34.0815168 24.4556044,33.6646835 23.9369063,33.6646835 C23.4182082,33.6646835 22.9995,34.0815168 22.9995,34.5983402 L22.9995,40.8217803 C22.9995,41.3382912 23.4182082,41.755437 23.9369063,41.755437 C24.4556044,41.755437 24.8743126,41.3382912 24.8743126,40.8217803 L24.8743126,34.5983402 Z" id="Shape"></path>
        </g>
    </g>
</svg>
				</div>
				<div class="button-child">

					<svg width="25px" height="25px" viewBox="0 0 25 25" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
    <!-- Generator: Sketch 50.2 (55047) - http://www.bohemiancoding.com/sketch -->
    <desc>Created with Sketch.</desc>
    <defs></defs>
    <g id="Page-1" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
        <g id="Artboard-3-Copy-2" transform="translate(-18.000000, -18.000000)" fill="#FC3E9F">
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				</div>
			</div>
		</div>
	</div>
	<div class="overlay"></div>
</div>
!

CSS 

              
                @import url('https://fonts.googleapis.com/css?family=Montserrat:100');

// Variables
$button-size: 65px;
$button-radius: 150px;
$button-transform-origin: $button-radius + ($button-size/2);

// Colors
$dark-purple: #131222;
$purple: #411a58;
$pink: #fc3e9f;
$green: #2dfbb2;

// Positioning / z-index
$z-1: 10;
$z-2: 20;
$z-3: 30;
$z-4: 40;

// Easings
$bounce: cubic-bezier(0.5, -0.5, 0.5, 1.5);
$bezier: cubic-bezier(0.64, 0.04, 0.35, 1);

// Timings
$delay: 500ms;
$time: 300ms;
$longer-time: ($time*2); // all about naming, right?

// Mixins
@mixin neon-fx($color) {
	box-shadow: 0 0 9px 2px $color, 0 0 9px 2px $color inset;
}

// Keyframes
@keyframes flicker {
	0%,
	19%,
	21%,
	23%,
	25%,
	54%,
	56%,
	100% {
		@include neon-fx($pink);
	}

	20%,
	24%,
	55% {
		box-shadow: none;
		opacity: 0.8;
	}
}

@keyframes flicker-icon {
	0%,
	19%,
	21%,
	23%,
	25%,
	54%,
	56%,
	100% {
		fill: $pink;
	}

	20%,
	24%,
	55% {
		fill: $purple;
		opacity: 0.8;
	}
}

* {
	box-sizing: border-box;
}

html,
body {
	height: 100%;
	margin: 0;
	padding: 0;
}

body {
	background-color: $dark-purple;
	font-family: 'Montserrat', sans-serif;
	display: flex;
	align-items: center;
	justify-content: center;
}

.mobile-canvas {
	position: relative;
	z-index: $z-1;
	width: 375px;
	height: 667px;
	overflow: hidden;
	background-color: $purple;
	padding: 2em;
	
	h1 {
		transition: all $time ease-in-out;
		color: white;
		font-weight: 100;
		font-size: 4rem;
	}

	&.open {
		.overlay {
			opacity: 0.6;
		}
		
		h1 {
			filter: blur(5px);
		}
	}
}

.overlay {
	position: absolute;
	z-index: $z-2;
	width: 100%;
	height: 100%;
	opacity: 0;
	top: 0;
	left: 0;
	transition: all $time ease-in-out;
	background: darken($purple,10);
}

.button-container {
	position: absolute;
	bottom: 40px;
	right: 40px;
	width: $button-size;
	height: $button-size;

	.button-wrapper {
		position: relative;
		width: 100%;
		height: 100%;
	}

	&.open {
		.button {
			border-color: $green;
			@include neon-fx($green);

			span {
				width: 3px;
				background-color: $green;
				@include neon-fx($green);
				transition: margin $time, transform $time, border-radius $time $longer-time,
					height $time $longer-time;

				&:first-child,
				&:last-child {
					margin: 0;
					height: 30px;
					border-radius: 5px;
				}

				&:first-child {
					transform: translate(-50%, -50%) rotate(45deg);
				}

				&:nth-of-type(2) {
					opacity: 0;
				}

				&:last-child {
					transform: translate(-50%, -50%) rotate(-45deg);
				}
			}
		}

		.button-child-wrapper {
			transform: translateX((-$button-radius));
			transition-delay: 0s;
		}

		.button-child {
			@include neon-fx($pink);
			transition-delay: $delay;
			//animation: flicker 1.5s infinite alternate;

			svg {
				opacity: 1;
				visibility: visible;
				transition-delay: $delay;

				g {
					animation: flicker-icon 1.5s infinite alternate;
				}
			}

			&:nth-child(2) {
				transform: rotate(45deg);
			}

			&:nth-child(3) {
				transform: rotate(90deg);
			}
		}
	}
}

.button,
.button-child-wrapper {
	position: absolute;
	width: 100%;
	height: 100%;
	top: 0;
	right: 0;
	bottom: 0;
	left: 0;
}

.button {
	border-radius: 50%;
	border: 3px solid $pink;
	z-index: $z-4;
	@include neon-fx($pink);
	transition: all $time ease-in-out $delay;

	span {
		position: absolute;
		top: 50%;
		left: 50%;
		transform: translate(-50%, -50%);
		width: 5px;
		height: 5px;
		background-color: $pink;
		border-radius: 50%;
		@include neon-fx($pink);
		transition: height $time, transform $longer-time, margin $time $longer-time,
			background-color $longer-time, border-radius $longer-time;

		&:first-child,
		&:last-child {
		}

		&:first-child {
			margin-top: -10px;
		}

		&:last-child {
			margin-top: 10px;
		}
	}
}

.button-child-wrapper {
	transition: transform 0.3s $bounce $delay;
	z-index: $z-3;
}

.button-child {
	position: absolute;
	display: flex;
	align-items: center;
	justify-content: center;
	width: 100%;
	height: 100%;
	top: 0;
	right: 0;
	bottom: 0;
	left: 0;
	border-radius: 50%;
	border: 3px solid $pink;
	transform-origin: $button-transform-origin;
	transition: all $time $bezier;

	&:nth-child(2) {
		svg {
			transform: rotate(-45deg);
		}
	}

	&:nth-child(3) {
		svg {
			transform: rotate(-90deg);
		}
	}

	svg {
		opacity: 0;
		visibility: hidden;
		transition: all $longer-time $bezier calc((-$delay)/2);
	}
}
!

JS 

              
                var buttonContainer = document.querySelector('.button-container');
var overlay = document.querySelector('.overlay');
var mobileCanvas = document.querySelector('.mobile-canvas')

buttonContainer.addEventListener('click', function() {
	buttonContainer.classList.toggle('open');
	mobileCanvas.classList.toggle('open');
}, false);
!
999px

Console