<div class="wrap">
  <div class="box uni"></div>
  <div class="box-2 uni"></div>

↑ Insert the most common viewport meta tag


              .box {
  -webkit-transition-timing-function: steps(4, start);
  -moz-transition-timing-function: steps(4, start);
  -o-transition-timing-function: steps(4, start);
  transition-timing-function: steps(4, start);

.box-2 {
  -webkit-transition-timing-function: steps(4, end);
  -moz-transition-timing-function: steps(4, end);
  -o-transition-timing-function: steps(4, end);
  transition-timing-function: steps(4, end);

.box:hover, .box-2:hover {
  background-color: lightblue;
  cursor: pointer;

.uni {
  box-sizing: border-box;
  float: left;
  border: solid 1px black;
  width: 150px;
  height: 150px;
  background: goldenrod;
  margin-top: 20px;
  margin-left: 2px;
  -webkit-transition-duration: 3s;
  -moz-transition-duration: 3s;
  -o-transition-duration: 3s;
  transition-duration: 3s;
  -webkit-transition-property: background-color;
  -moz-transition-property: background-color;
  -o-transition-property: background-color;
  transition-property: background-color;

.wrap {
  width: 304px;
  overflow: hidden;
  margin: auto;
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