JSFiddle - React, Tailwind, and code Playground

HTML

<section>
  <h2>Heading</h2>
</section>

SCSS

section {
  position: relative;
  text-align: center;
  padding: 120px 0;
  
  &:after {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: red;
    content: '';
    transition: all .15s ease-in-out;
  }
}

h2 {
  position: relative;
  z-index: 1;
}


// Hover
section:hover {
  
  &:after {
    opacity: .6;
  }
}