JSFiddle - React, Tailwind, and code Playground

HTML

<div class="flex-group">
  <ul class="flex-container red">
    <li class="flex-item">11<br />2</li>
    <li class="flex-item">2</li>
    <li class="flex-item">3</li>
  </ul>

  <ul class="flex-container gold">
    <li class="flex-item">1</li>
    <li class="flex-item">2</li>
    <li class="flex-item">3</li>
    <li class="flex-item">4</li>
    <li class="flex-item">5</li>
  </ul>

  <ul class="flex-container blue">
    <li class="flex-item">1</li>
    <li class="flex-item">2</li>
    <li class="flex-item">3</li>
    <li class="flex-item">4</li>
    <li class="flex-item">5</li>
    <li class="flex-item">6</li>
    <li class="flex-item">7</li>
    <li class="flex-item">8</li>
  </ul>
<div>

CSS

.flex-group {
    margin: auto;
    display: flex;
    flex-direction: row;
    justify-content: space-around;
}

.flex-container {
    flex: 0 100%;
    
    display: flex;
    flex-flow: row wrap;
    align-items: space-around;
    align-content: flex-start;
    
    padding: 0;
    margin: 0;
    list-style: none;
    border: 1px solid silver;
}

.red li {
    background: red;
}

.gold li {
    background: gold;
}

.blue li {
    background: deepskyblue;
}

.flex-item {
    flex: 0 1 auto;
    
    padding: 5px;
    width: 100px;
    height: 100px;
    margin: 10px;
  
    line-height: 100px;
    color: white;
    font-weight: bold;
    font-size: 2em;
    text-align: center;
}