JSFiddle - React, Tailwind, and code Playground

HTML

<div class="imgWrap">
  <img src="http://placehold.it/350x200">
</div>

CSS

.imgWrap {
  position: relative;
  display: inline-block;
}

.imgWrap::after {
    content: "";
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background: linear-gradient(to bottom, rgba(255,255,255,0) 0%,rgba(0,0,0,1) 100%);
}