CodePen Embed - yvVrQz

<ul class="list-design">
  <li>あいうえお</li>
  <li>かきくけこ</li>
  <li>さしすせそ</li>
  <li>たちつてと</li>
  <li>なにぬねの</li>
</ul>

.list-design {
  list-style: none;
}

.list-design li:not(:last-child) {
  border-bottom: 1px solid #CCC;
}

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