bootstrap-5-guides.html

<div class="fixed-top h-100 w-100 bsgg-grid">
    <div class="container h-100">
        <div class="row bootstrap-grid-12 collapse h-100">
            <div class="col bsgg-grid-border"><div class="h-100 bsgg-grid-outline"></div></div>
            <div class="col bsgg-grid-border"><div class="h-100 bsgg-grid-outline"></div></div>
            <div class="col bsgg-grid-border"><div class="h-100 bsgg-grid-outline"></div></div>
            <div class="col bsgg-grid-border"><div class="h-100 bsgg-grid-outline"></div></div>
            <div class="col bsgg-grid-border"><div class="h-100 bsgg-grid-outline"></div></div>
            <div class="col bsgg-grid-border"><div class="h-100 bsgg-grid-outline"></div></div>
            <div class="col bsgg-grid-border"><div class="h-100 bsgg-grid-outline"></div></div>
            <div class="col bsgg-grid-border"><div class="h-100 bsgg-grid-outline"></div></div>
            <div class="col bsgg-grid-border"><div class="h-100 bsgg-grid-outline"></div></div>
            <div class="col bsgg-grid-border"><div class="h-100 bsgg-grid-outline"></div></div>
            <div class="col bsgg-grid-border"><div class="h-100 bsgg-grid-outline"></div></div>
            <div class="col bsgg-grid-border"><div class="h-100 bsgg-grid-outline"></div></div>
        </div>
    </div>
</div>
<div class="fixed-bottom pe-none">
  <div class="btn-group bsgg-btn-group pe-auto">
    <div class="bsgg-rl font-weight-bold px-3 py-2 btn btn-danger d-inline-block d-sm-none">XS</div>
    <div class="bsgg-rl font-weight-bold px-3 py-2 btn btn-warning d-none d-sm-inline-block d-md-none">SM</div>
    <div class="bsgg-rl font-weight-bold px-3 py-2 btn btn-success d-none d-md-inline-block d-lg-none">MD</div>
    <div class="bsgg-rl font-weight-bold px-3 py-2 btn btn-info d-none d-lg-inline-block d-xl-none">LG</div>
    <div class="bsgg-rl font-weight-bold px-3 py-2 btn btn-primary d-none d-xl-inline-block d-xxl-none">XL</div>
    <div class="bsgg-rl font-weight-bold px-3 py-2 btn btn-primary d-none d-xxl-inline-block">XXL</div>
    <button class="bsgg-rr font-weight-bold p-2 btn btn-secondary" data-bs-toggle="collapse" data-bs-target=".bootstrap-grid-12">GRID</button>
  </div>
</div>