JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
  <li class="_0mb"></li>
  <li class="_3mb"></li>
  <li class="_7mb"></li>
  <li class="_14mb"></li>
  <li class="_20mb"></li>
  <li class="oltre_20mb"></li>
</ul>

CSS

.red{
    color: red;
    background-color: red;
}

JavaScript

$("li").on('click', function(){
    $('li').removeClass('red');
    $(this).addClass('red');
    $(this).prevAll().addClass('red');
})