CodePen Embed - 内側に線を入れる方法（box-sizing使用）

<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>
</ul>

ul {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  list-style: none;
}

li {
  text-align: center;
  width: 23.5%;
  background:#000;
  color: #fff;
  padding: 2rem 0;
  border: 10px solid gray;
  box-sizing: border-box;
}

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