hhow to use "%" in css code example

Example 1: adding css to html

<head>
  <!-- Linking external Css document -->
  <link rel="stylesheet" href="styles.css">
  
  <!-- Writing Css inside HTML element -->
  <style>
    ...
  </style>
</head>

Example 2: . and # in css

<!DOCTYPE html>
<html>
<head>
<style>
.classname {
  background-color: green;
  color: white;
}
#idname {
  background-color: pink;
  color: white;
}
</style>
</head>
<body>
<div class="classname">I am  green colour<div>
<div id="idname">I am  pink colour</div>
</body>
</html>

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Css Example