JSFiddle - React, Tailwind, and code Playground

HTML

<div>
    <img src="http://assets3.parliament.uk/iv/main-large//ImageVault/Images/id_7382/scope_0/ImageVaultHandler.aspx.jpg" alt="" />
    <p class="description_content">example</p>
</div>

CSS

div {
    position: relative;
}
img, p {
    width: 100%;
}
p {
    position: absolute;
    background-color: rgba(0, 0, 0, 0.5);
    padding: 10px;
    bottom: 0;
    left: 0;
    box-sizing: border-box;
    color: #fff;
    margin: 0;
}