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HTML

              
                .menu-icon
	.line.top
	.line.right
	.line.bottom
	.line.left
              
            
!

CSS

              
                .menu-icon
	border: 1px solid #333
	height: 40px
	cursor: pointer
	left: 50%
	position: absolute
	margin: -20px 0 0 -20px
	top: 50%
	transition: all 200ms ease-out
	width: 40px

	&:after, &:before
		background:
			color: #333
		content: ''
		height: 1px
		left: 50%
		top: 50%
		transform: translate3d(-50%, -50%, 0) rotate(45deg)
		transition: all 400ms cubic-bezier(0.25, 0.60, 0.36, 1)
		position: absolute
		top: 50%
		width: 25px
	
	>.line
		background: #333
		height: 1px
		position: absolute
		transition: all .1s cubic-bezier(0.46, 0.03, 0.52, 0.96)
		width: 0%
	
		&.top
			left: 0
			top: 0
			transition-delay: .3s
	
		&.bottom
			bottom: 0
			right: 0
			transform: rotate(180deg)
			transition-delay: .1s
	
		&.left
			left: 0
			top: 0
			transform: translate3d(0,40px,0) rotate(-90deg)
			transform-origin: 0
			transition-delay: 0s
	
		&.right
			left: 0
			top: 0
			transform: translate3d(40px,0,0) rotate(90deg)
			transform-origin: 0
			transition-delay: .2s
	
	&:before
		transform: translate3d(-50%, -50%, 0) rotate(-45deg)
		transition-delay: 65ms
	
	&:hover
		.line
			width: 100%
			&.top
				transition-delay: 0ms
			&.right
				transition-delay: .1s
			&.bottom
				transition-delay: .2s
			&.left
				transition-delay: .3s
				
		
		
		&:after
			transform: translate3d(-50%, -50%, 0) rotate(225deg)
		&:before
			transform: translate3d(-50%, -50%, 0) rotate(135deg)
		
	&:active
		opacity: .8
		transition: none

		
              
            
!

JS

              
                
              
            
!
999px

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