HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>Flexbox flex: 1</title>
  <style>
    .row {
      display: flex;
      gap: 10px;
    }

    .item {
      flex: 1;
      padding: 0.65rem 0.5rem;
      border-radius: 5px;
      background: rgba(96, 139, 168, 0.2);
      border: 2px solid rgb(96, 139, 168);
      color: #1e3a4c;
      font-family: system-ui, sans-serif;
      font-size: 0.875rem;
      text-align: center;
    }
  </style>
</head>
<body style="margin:0;padding:1.5rem;font-family:system-ui,sans-serif;">
  <div class="row">
    <div class="item">One</div>
    <div class="item">Two</div>
    <div class="item">Three</div>
  </div>
</body>
</html>

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CSS Flexbox — flex: 1