<figure class="container">
  <img src="https://assets.codepen.io/5928893/masking-balloons.jpg" alt="balloons">
  <figcaption>Balloons</figcaption>
</figure>
body {
  font-family: "Benton Sans", "Helvetica Neue", helvetica, arial, sans-serif;
  margin: 2em;
}

img {
  max-width: 100%;
  display: block;
}

.container {
  max-width: 400px;
  hight: 300px;
  margin: 1em auto;
  position: relative;
  border:1px solid #ccc;
  
}

.container img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  -webkit-mask-image: linear-gradient(to top, transparent 5%, black 100%);
  mask-image: linear-gradient(to top, transparent 5%, black 100%);*/
} 

.container figcaption {
  position: absolute;
  bottom: 1em;
  right: 1em;
  font-size: 150%;
  color: #333;
}

External CSS

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External JavaScript

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