overlay on round image code example

Example: css circle with overlay

// html 
<div class="container"> <!-- container is just for centering, it is not needed in the solution  -->
  <div class="circle">
    <div class="overlay">
    </div>
  </div>
</div>

// Css

html, body {
  margin: 0;
}
.container {
  width: 100vw;
  height: 100vh;
  margin:0;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: rgb(64, 64, 64);
}
.circle {
  width: 200px;
  height: 200px;
  border-radius: 100px;
  background-color: rgb(21, 156, 228);
}
.overlay {
  position: absolute;
  width: 200px;
  height: 200px;
  border-radius: 100px;
  opacity: 0;
  background-color: black;
  transition: .4s ease;
}
.overlay:hover {
	opacity: .4;
}

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Css Example