CODE EXAMPLE FOR HTML

flexbox column layout

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<div class="container">
  <div class="item">
    <p>1</p>
  </div>
  <div class="item">
    <p>2</p>
  </div>
  <div class="item">
    <p>3</p>
  </div>
  <div class="item">
    <p>4</p>
  </div>
  <div class="item">
    <p>5</p>
  </div>
  <div class="item">
    <p>6</p>
  </div>
</div>

<style>
:root{
  --padding:10px;
  --one-third-width: 33.33%;
  --white: #FFFFFF;
}

.container{
  width:300px;
  height:300px;
  display:flex;
  dlex-direction:row;
  justify-content:space-between;
  flex-wrap:wrap;
  row-gap:10px;
}


.item{
  background:red;
  display:inline-flex;
  color:var(--white);
  width:calc(var(--one-third-width) - 30px);
  height:50%;
  padding:var(--padding);
}

p{  
  padding:var(--padding);
  margin: 0;
}
</style>