JSFiddle - React, Tailwind, and code Playground

HTML

<div data-content="Here is some text added on hover via a content value of attr(data-content)" class="image">
    <img src="http://i.stack.imgur.com/Sjsbh.jpg" alt="" />
</div>

<hr>
    
<div data-content="More text.. as you can see, this approach works with multiple images" class="image">
    <img src="http://i.stack.imgur.com/Sjsbh.jpg" alt="" />
</div>

CSS

.image {
    position:relative;
    width:200px;
    height:200px;
}
.image img {
    width:100%;
    vertical-align:top;
}
.image:after {
    content: attr(data-content);
    color:#fff;
    position:absolute;
    width:100%; height:100%;
    top:0; left:0;
    background:rgba(0,0,0,0.6);
    opacity:0;
    transition: all 0.5s;
    -webkit-transition: all 0.5s;
}
.image:hover:after {
    opacity:1;
}