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Notice how Bootstrap intrinsically modifies the outlook of a few HTML elements.
RESETRUNFULL
<!DOCTYPE html><html>
<head><link href='https://cdn.jsdelivr.net/npm/bootstrap@5.2.0-beta1/dist/css/bootstrap.min.css' rel='stylesheet' integrity='sha384-0evHe/X+R7YkIZDRvuzKMRqM+OrBnVFBL6DOitfPri4tjfHxaWutUpFmBp4vmVor' crossorigin='anonymous'>
      <script src='https://cdn.jsdelivr.net/npm/bootstrap@5.2.0-beta1/dist/js/bootstrap.bundle.min.js' integrity='sha384-pprn3073KE6tl6bjs2QrFaJGz5/SUsLqktiwsUTF55Jfv3qYSDhgCecCxMW52nD2' crossorigin='anonymous'></script>
      <style>div:not(.container):not(.tooltip):not(.tooltip *):not(.navbar *):not(.carousel-caption):not(.card *):not(.form-check):not(.input-group) { border:1px solid grey; text-align:center; }</style>
</head><body>

   <code>alert('good!');</code><br/>
   <kbd>CTRL</kbd>+<kbd>F</kbd><br/>
   <var>y</var> = <var>m</var><var>x</var> + <var>b</var><br/>
   <samp>This text is meant to be treated as sample output from a computer program.</samp>

</body><html>

You may optionally add the .pre-scrollable class, which will set a max-height of 340px and provide a y-axis scrollbar.