JSFiddle - React, Tailwind, and code Playground

HTML

<div class="columns">
<div class="columns__container">
    <div class="columns__item item">1</div>
    <div class="columns__item item">2</div>
    <div class="columns__item item">3</div>
    <div class="columns__item item">4</div>
    <div class="columns__item item">5</div>
    <div class="columns__item item">6</div>
    <div class="columns__item item">7</div>
    <div class="columns__item item">8</div>
    <div class="columns__item item">9</div>
</div>
</div>

SCSS

$blue: #0084ff;

body {
  background: white;
  font-family: Helvetica;
}

.columns {
  height: 200px;
  border: 3px solid red;
  overflow: auto;

  &__container {
    column-count:2;
  }
  
  &__item {
    page-break-inside: avoid; // prevent break content: modern
    display: inline-block;    // prevent break content: fallback
  
    margin-bottom: 16px;

    &:last-child {
      margin-bottom: 0;
    }
  }
}

.item {
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: $blue;
  border-radius: 3px;
  padding: 20px 0;
}