TryIt Editor v2.0 - Example of overlaying an image on hover:

Source Code: (back to article)

<!DOCTYPE html>
<html>
  <head>
    <style>
      .container {
        position: relative;
        width: 50%;
      }
      .image {
        display: block;
        width: 100%;
        height: auto;
      }
      .overlay {
        position: absolute;
        top: 0;
        bottom: 0;
        left: 0;
        right: 0;
        height: 100%;
        width: 100%;
        opacity: 0;
        transition: .7s ease;
        background-color: #339c57;
      }
      .container:hover .overlay {
        opacity: 1;
      }
      .text {
        color: white;
        font-size: 18px;
        position: absolute;
        top: 50%;
        left: 50%;
        -webkit-transform: translate(-50%, -50%);
        transform: translate(-50%, -50%);
        text-align: center;
      }
    </style>
  </head>
  <body>
    <div class="container">
      <img src="https://images.unsplash.com/photo-1583528306385-8f29f27cb2d6?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=500&q=60" alt="travel" class="image">
      <div class="overlay">
        <div class="text">Travel</div>
      </div>
    </div>
  </body>
</html>