<img class="glow" src="https://images.unsplash.com/photo-1463438690606-f6778b8c1d10?ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&ixlib=rb-1.2.1&auto=format&fit=crop&w=400&q=80" alt="" aria-hidden="true" /><img class="img" src="https://images.unsplash.com/photo-1463438690606-f6778b8c1d10?ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&ixlib=rb-1.2.1&auto=format&fit=crop&w=400&q=80" alt="Potted trees beside a colourful window" />
body {
  background: #222;
  display: flex;
  justify-content: center;
}

.glow {
  position: absolute;
  z-index: 0;
  filter: blur(100px);
}

.img {
  position: relative;
  z-index: 1;
  border-radius: 20px;
}
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