JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <img src="http://lorempixel.com/output/city-q-c-640-480-8.jpg" />
    <div class="caption">
        <a href="#">Gallery 1</a>
    </div>
</div>

CSS

img { max-width: 100%; }
body { width: 100%; height: 100%; }
.container {
    position: relative;
    width: 250px;
}

.caption {
    position:absolute;
    height: 100%;
    width: 100%;
    top: 0;
    left: 0;
    display: table;
    background: rgba(255, 255, 255, 0.75);
}

.caption a {
    display: table-cell;
    vertical-align: middle;
    text-align:center;
}