CodePen Embed - css transitions test

<div></div>

div {
  margin: 50px auto;
  width: 150px;
  height: 150px;
  background: black;
  transition-property: background;
  transition-timing-function: ease-in-out;
  transition-duration: 2s;
  transition-delay: 1s;
}
div:hover {
  background: red;
}

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