css selected a code example

Example 1: css on click

<!DOCTYPE html>
<html>
<head>
  <style>
    /* On click: */
    a:active {
      background-color: yellow;
    }
    button:focus {
      background-color: yellow;
    }
    /* On hover: */
    h1:hover {
      background-color: red;
    }
    p:hover {
      background-color: red;
    }
  </style>
</head>
<body>
  <a href="#">Click Me</a>
  <button>Click me</button>
  
  <h1>Hover over me</h1>
  <p>Hover over me</p>
</body>
</html>

Example 2: how to add a selection in css

<div class="custom-select-wrapper">
    <div class="custom-select">
        <div class="custom-select__trigger"><span>Tesla</span>
            <div class="arrow"></div>
        </div>
        <div class="custom-options">
            <span class="custom-option selected" data-value="tesla">Tesla</span>
            <span class="custom-option" data-value="volvo">Volvo</span>
            <span class="custom-option" data-value="mercedes">Mercedes</span>
        </div>
    </div>
</div>

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Html Example