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HTML

CSS

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HTML

              
                    <nav>
      <ul class="menu">
        <li><a href="">Home</a></li>
        <li><a href="">Order Status</a></li>
        <li><a href="">Tweets</a></li>
        <li><a href="">Read Our History</a></li>
        <li><a href="">Contact Us</a></li>
      </ul>
    </nav>

    <div class="wrapper">
      <p>Lorem ipsum dolor sit amet, <a href="">consectetur</a> adipisicing elit. Est <a href="">explicabo</a> unde natus necessitatibus esse obcaecati distinctio, aut itaque, qui vitae!</p>
      <p>Aspernatur sapiente quae sint <a href="">soluta</a> modi, atque praesentium laborum pariatur earum <a href="">quaerat</a> cupiditate consequuntur facilis ullam dignissimos, aperiam quam veniam.</p>
      <p>Cum ipsam quod, incidunt sit ex <a href="">tempore</a> placeat maxime <a href="">corrupti</a> possimus <a href="">veritatis</a> ipsum fugit recusandae est doloremque? Hic, <a href="">quibusdam</a>, nulla.</p>
      <p>Esse quibusdam, ad, ducimus cupiditate <a href="">nulla</a>, quae magni odit <a href="">totam</a> ut consequatur eveniet sunt quam provident sapiente dicta neque quod.</p>
      <p>Aliquam <a href="">dicta</a> sequi culpa fugiat <a href="">consequuntur</a> pariatur optio ad minima, maxime <a href="">odio</a>, distinctio magni impedit tempore enim repellendus <a href="">repudiandae</a> quas!</p>
    </div>
              
            
!

CSS

              
                html {
  box-sizing: border-box;
}

*, *:before, *:after {
  box-sizing: inherit;
}

body {
  min-height: 100vh;
  margin: 0; /* Important! */
  font-family: sans-serif;
  background:
    linear-gradient(45deg, hsla(340, 100%, 55%, 1) 0%, hsla(340, 100%, 55%, 0) 70%),
    linear-gradient(135deg, hsla(225, 95%, 50%, 1) 10%, hsla(225, 95%, 50%, 0) 80%),
    linear-gradient(225deg, hsla(140, 90%, 50%, 1) 10%, hsla(140, 90%, 50%, 0) 80%),
    linear-gradient(315deg, hsla(35, 95%, 55%, 1) 100%, hsla(35, 95%, 55%, 0) 70%);
}

.wrapper {
  margin: 0 auto;
  max-width: 500px;
  font-size: 20px;
  line-height: 2;
  position: relative;
}

a {
  text-decoration: none;
  color: black;
  background: rgba(0,0,0,0.05);
  border-radius: 20px;
}

.highlight {
  transition: all 0.2s;
  border-bottom: 2px solid white;
  position: absolute;
  top: 0;
  background: white;
  left: 0;
  z-index: -1;
  border-radius: 20px;
  display: block;
  box-shadow: 0 0 10px rgba(0,0,0,0.2);
}

.menu {
  padding: 0;
  display: flex;
  list-style: none;
  justify-content: center;
  margin:100px 0;
}

.menu a {
  display: inline-block;
  padding: 5px;
  margin: 0 20px;
  color: black;
}

              
            
!

JS

              
                    let now = null
    const triggers = document.querySelectorAll('a')
    const highlight = document.createElement('span')
    highlight.classList.add('highlight')
    document.body.appendChild(highlight)

    function highlightLink () {
      now = this
      setPostion()
    }

    function setPostion() {
      if(!now) return
      const linkCoords = now.getBoundingClientRect();
      // console.log(linkCoords);
      const coords = {
        width: linkCoords.width,
        height: linkCoords.height,
        top:linkCoords.top + window.scrollY,
        left:linkCoords.left + window.scrollX,
      };   
      highlight.style.width = `${coords.width}px`
      highlight.style.height = `${coords.height}px`
      highlight.style.top = `${coords.top}px`
      highlight.style.left = `${coords.left}px`
    }

    triggers.forEach(a => {
      a.addEventListener('mouseenter', highlightLink)
    })

       window.addEventListener('resize', setPostion)
              
            
!
999px

Console