小编ste*_*002的帖子

ul {
  align-items: stretch;
  justify-content: center;
  background: lightgrey;
  display: flex;
  flex-direction: row;
  height: 80px;
  justify-content: flex-start;
  padding-top: 20px;
  padding-bottom: 20px;
}
li {
  background-color: #303E49;
  display: flex;
  list-style: none;
  margin-right: 0.5em;
}
a {
  color: white;
  text-decoration: none;
  margin: 0.5em 0.5em 0.5em 0.5em;
  border: 1px solid white;
}

Resize this window horizontally to see what I am talking about.

<ul>
  <li>
    <a href="#">HowCanIMakeThisBoxShrink
            WhenTheTextBreaksToANewLine?</a>
  </li>
  <li>
    <a href="#">Text</a>
  </li>
  <li>
    <a href="#">Text</a>
  </li>
</ul>