CodePen Embed - column-gap-test

<div id="flexbox">
  <div>1</div>
  <div>2</div>
  <div>3</div>
</div>



#flexbox {
  --bs-gutter-x: 20px;
  display: flex;
  height: 100px;
  column-gap: var(--bs-gutter-x);
  flex-wrap:wrap;
}

#flexbox > div {
  border: 1px solid green;
  background-color: lime;
  flex: 0 0 calc(50% - var(--bs-gutter-x)/2);
  box-sizing:border-box;
}

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