CodePen Embed - 2019-12-23-sample-01

<ul class="menu">
  <li>メニュー</li>
  <li>メニュー</li>
  <li>メニュー</li>
  <li>メニュー</li>
  <li>メニュー</li>
  <li>メニュー</li>
</ul>

.menu li {
  border-bottom: 1px solid #000;
}

.menu li:last-child {
  border-bottom: none;
}

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