JSFiddle - React, Tailwind, and code Playground

HTML

<div class="text">
This is my text
<div class="overlay"></div>
</div>

CSS

.text {position: relative;}
.overlay {
    position: absolute;
    background-color: red;
    top: 0;
    width: 100%;
    height: 100%;
    /* just to show you the text is still there! */
    opacity: 0.6;
}