fieldset border issue

by int32_t

HTML

<!DOCTYPE html>
<html>
  <body>
    <div style="padding: 20px; background:lime">
    foo
      <fieldset
        style="
          background-color: green;
          border: 1px solid rgba(0, 0, 0, 0.26);
          border-radius: 4px;
        "
      ></fieldset>
      bar
    </div>
  </body>
</html>