JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
  <li>aaa<br><br><br>ssss</li>
  <li>bbb</li>
  <div style = "clear: both"></div>
 </ul>

CSS

ul {
      background: red;
    list-style-type: none;
}
li {
      float: left;
      background: silver;
      margin: 10px;
}