CodePen Embed - YLWXON

<ul>
  <li>テキスト</li>
  <li>テキスト</li>
  <li>テキスト</li>
  <li>テキスト</li>
  <li>テキスト</li>
</ul>

ul li:nth-child(-n+3){
  background:lightblue;
}

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