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CSS Property Value - 如何calc(100％ - 5px);

calc

我们想知道如何calc(100％ - 5px);


<!DOCTYPE html>
<html>
<head>
<style type='text/css'>
.container {
  width: 120px;
  height: 100px;
  margin: 0;
  padding: 0;
  clear: both;
  background-color: blue;
}

.child {
  width: calc(100% - 5px);
  height: calc(100% - 5px);
  border: 5px solid red;
}
</style>
</head>
<body>
  <div class="container">
    <div class="child">text</div>
  </div>
</body>
</html>