Trasition opacity

.fade {
   opacity: 1;
   transition: opacity .25s ease-in-out;
   -moz-transition: opacity .25s ease-in-out;
   -webkit-transition: opacity .25s ease-in-out;
   }

   .fade:hover {
      opacity: 0.5;
      }

Source: bavotasan.com

Css opacity transition

div {
  transition: opacity seconds;
}

-2

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