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HTML

            
              <div class="box uni"></div>
            
          
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CSS

            
              .box {
  width: 150px;
  height: 150px;
  background: goldenrod;
  margin-top: 20px;
  margin-left: auto;
  margin-right: auto;
  -webkit-transition-delay: 2s;
  -moz-transition-delay: 2s;
  -o-transition-delay: 2s;
  transition-delay: 2s;
}

.box:hover {
  background-color: blue;
  cursor: pointer;
}

.uni {
   -webkit-transition-duration: 1s;
  -moz-transition-duration: 1s;
  -o-transition-duration: 1s;
  transition-duration: 1s;
  -webkit-transition-property: background-color;
  -moz-transition-property: background-color;
  -o-transition-property: background-color;
  transition-property: background-color;
}
            
          
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JS

            
              
            
          
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