:nth-child(odd) or :nth-child(even) pseudo-class selectors to apply a different background-color to elements that match based on their position in a group of siblings.<div>, <tr>, <p>, <ol>, etc.<ul> <li>Item 01</li> <li>Item 02</li> <li>Item 03</li> <li>Item 04</li> <li>Item 05</li> </ul>
li:nth-child(odd) {
  background-color: #999;
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