Animation How to - Create animation and maintain z-index ::before

Question

We would like to know how to create animation and maintain z-index ::before.

Answer


<!DOCTYPE html>
<html>
<head>
<style type='text/css'>
.object {<!--from w  w  w. j  a  v a  2 s.  co m-->
  position: relative;
  -webkit-animation: scale 1s infinite ease-in-out;
  animation: scale 1s infinite ease-in-out;
}
.object::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 50px;
  height: 50px;
  border: 20px solid red;
  z-index: 1;
}

.object::before {
  content: "";
  position: absolute;
  width: 70px;
  height: 70px;
  border: 10px solid blue;
  z-index: -1;
  top: 20px;
  left: 20px;
}

@keyframes scale { 
  0% {transform: scale(1, 1);}
  50%{transform:scale(.5,.5);}
  100%{transform:scale(1,1);}
}
@-webkit-keyframes scale { 
   0% {-webkit-transform: scale(1, 1);}
   50%{-webkit-transform:scale(.5,.5);}
   100%{-webkit-transform:scale(1,1);}
}
</style>
</head>
<body>
  <div class="object"></div>
</body>
</html>

The code above is rendered as follows: