CodePen Embed - Exapmple transitions css

<div class="block-animation"></div>

        .block-animation {
          width: 130px;
          height: 130px;
          background-color: #2196F3;
          transition: background-color 1s linear;
        }
        
        .block-animation:hover {
          background-color: #3F51B5;
        }

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