Transition css hover

/* Transition is how much my element will take time to change his state 
   or apply a specific style on it at specific */
.my-div{
  background-color: #f00; /*Red*/
  transition: 3s ease-in-out;
  /* transition: .5s ease-in-out; [0.5 seconds] */
}
.my-div:hover{
  background-color: #00f; /*Blue*/
}
/* .my-div background-color will be changed from red to blue in 3 seconds*/

Transition on hover

div {
  transition: background-color 0.5s ease;
  background-color: red;
}
div:hover {
  background-color: green;
}

Source: css-tricks.com

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