JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container">
    <img src="http://dummyimage.com/200x200/000000/fff&text=Background"/>
        <img id="watermark" src="http://dummyimage.com/50x50/fff/000&text=Watermark"/>
</div>

CSS

#container {
    position:relative;
    width: 200px;
    height: 200px;
}
#container img {
    position: absolute;
}
#container #watermark {
    bottom: 10px;
    right: 10px;
}