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<!DOCTYPE html>
<html>
<head>
<style>
.box {
  width: 150px;
  height: 150px;
  background-color: pink;
  opacity: 1;
  transition: all 0.9s ease;
  @starting-style {
    opacity: 0;
    translate: 0 -80px;
  }
}
</style>
</head>
<body>
<h1>Demo of @starting-style</h1>
<div class="box">HELLO!</div>
</body>
</html>