JSFiddle - React, Tailwind, and code Playground

HTML

<div class="block">
  <div class="img-container">
    <div class="qube"></div>
    <img src="https://images.pexels.com/photos/540518/pexels-photo-540518.jpeg">
  </div>
</div>

CSS

.img-container {
    position: relative;
    width: 500px;
}
.img-container img {
  max-width:500px;
}
.qube {
    height: 100px;
    width: 200px;
    left: 50%;
    overflow: hidden;
    top: 50%;
    position: absolute;
    transform: translateX(-50%) translateY(-50%);
}
.qube:before {
    content: '';
    position: absolute;
    bottom: 75%;
    width: 50px;
    height: 50px;
    left: 50%;
    border-radius: 100%;
    box-shadow: 0px 300px 0px 350px rgba(0, 0, 0, 0.25);
    transform: translateX(-50%);
}