JSFiddle - React, Tailwind, and code Playground

by Manuel Castro

HTML

<ul>
  <li>1</li>
  <li>2</li>
  <li>3</li>
  <li class="active">4</li>
  <li>5</li>
  <li>6</li>
  <li>7</li>
</ul>

CSS

li {
  width: 2em;
  height: 2em;
  text-align: center;
  line-height: 2em;
  border-radius: 1em;
  background: dodgerblue;
  margin: 0 1em;
  display: inline-block;
  color: white;
  position: relative;
  transition: all 0.5s;
  cursor: pointer;
}

li::before{
  content: '';
  position: absolute;
  top: .9em;
  left: -4em;
  width: 4em;
  height: .2em;
  background: dodgerblue;
  z-index: -1;
  transition: all 1s;
}



li:first-child::before {
  display: none;
}

.active {
  background: dodgerblue;
}

.active ~ li {
  background: lightblue;
}

.active ~ li::before {
  background: lightblue;
}

body {
  font-family: sans-serif;
  padding: 2em;
}

JavaScript

$('ul').on('click', 'li', function() {
    $('ul li.active').removeClass('active');
    $(this).addClass('active');
});