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HTML

CSS

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JavaScript

Babel includes JSX processing.

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HTML

              
                h1
  a(href='#')
    span &nbsp; Hover Me &nbsp;
              
            
!

CSS

              
                $sky: #259EF5

body
	color: $sky
	font-family: 'Maven Pro', sans-serif
	height: 100vh
	align-items: center
	overflow: hidden
	display: flex

	h1
		margin: auto

		a
			text-decoration: none
			color: inherit
			position: relative

			&:hover
				color: $sky

			&::before,
			&::after,
			span::before,
			span::after
				content: ''
				position: absolute
				background: $sky
				transition: all 0.2s ease-in

			&::before,
			&::after
				height: 2px
				width: 0

			&::before
				bottom: 0

			&::after
				right: 0

			&:hover::after,
			&:hover::before
				width: 100%

			span::before,
			span::after
				width: 2px
				height: 0

			span::before
				bottom: 0

			span:hover::before,
			span:hover::after
				height: 100%
              
            
!

JS

              
                /* CSS only */
              
            
!
999px

Console