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Sizing

To specify the dimensions of an element, use:
.[m | min-]{w | vw | h | vh}-{25 | 50 | 75 | 100 | auto}
where m means maximum, min means minimum, w means width, vw means width relative to the viewport, h means height, vh means height relative to the viewport, 25 means 25%, and so on.


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>

<div class="vw-100 vh-100">
   <div class="mx-auto w-25">
      CENTRE
   </div>
</div>

</body><html>