lled green square and <strong>no red</strong>.</p>
<div style="width:100px; height:100px; background:red;">
  <div style="width: 100px; columns: 2; column-gap: 0; position: relative;">
    <div id="flex">
      <div style="height: 25px;"></div>
      <div style="height: 25px;"></div>
      <div style="height: 50px;"></div>
      <div style="height: 25px; break-before: avoid;"></div>
      <div style="height: 75px;"></div>
      <div style="height: 25px;"></div>
      <div style="height: 25px;"></div>
      