Set two flex items side by side in a flexbox column

The layout is fairly simple with flexbox. You don't need flex-direction: column.

Just use flex-direction: row with flex-wrap: wrap.

Then make each element long enough to occupy a full row.

Reduce the flex-basis on the elements that are to share a row.

.flex-column {
  display: flex;
  flex-wrap: wrap;
}

.column-item {
  flex: 1 0 61%;  /* flex-grow, flex-shrink, flex-basis */
  margin: 2px;
  background-color: lightgreen;
}

.column-item:nth-of-type(4),
.column-item:nth-of-type(5) {
  flex-basis: 40%;
}
<div class="flex-column">
  <div class="column-item">a</div>
  <div class="column-item">b</div>
  <div class="column-item">c</div>
  <div class="column-item">d</div>
  <div class="column-item">e</div>
</div>

With flex-grow: 1 defined in the flex shorthand, there's no need to use calc().

Since flex-grow will consume free space on the row, flex-basis only needs to be large enough to enforce a wrap. In this case, with flex-basis: 61%, there's plenty of space for the margins, but never enough space for a second item.

There's an even simpler and more efficient solution using CSS Grid:

.flex-column {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-gap: 5px;
}

.column-item:nth-of-type(-n + 3) {
  grid-column: span 2;
}

.column-item {
  background-color: lightgreen;
}
<div class="flex-column">
  <div class="column-item">a</div>
  <div class="column-item">b</div>
  <div class="column-item">c</div>
  <div class="column-item">d</div>
  <div class="column-item">e</div>
</div>

I don't think it is possible once you have given your parent the flex-direction:column; property, alternatively you can enable flex-wrap:wrap and control the width of elements using the flex-basis property. This allows you to achieve the effect you want without altering your html structure.

.flex-column {
    display: flex;
    flex-wrap:wrap;
}

.flex-column .column-item {
 flex-basis:100%;}
.flex-column .column-item:nth-of-type(4),
.flex-column .column-item:nth-of-type(5) {
    flex-basis:50%;
   
    
}
<div class="flex-column">
    <div class="column-item">a</div>
    <div class="column-item">b</div>
    <div class="column-item">c</div>
    <div class="column-item">d</div>
    <div class="column-item">e</div>
</div>

Tags:

Html

Css

Flexbox

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