JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <img src="http://placehold.it/300x300" />
    <span class="overlay">This is some text</span>
</div>

CSS

.container {
    position:relative;
    width:300px;
}
.container .overlay {
    position:absolute;
    bottom:0;
    left:0;
    background:rgba(255,255,255,0.5);
    width:100%;
    padding:1em;
}