HTML代码：

<div class="shadow-none p-3 mb-5 bg-light rounded">No shadow</div>

<div class="shadow-sm p-3 mb-5 bg-body rounded">Small shadow</div>

<div class="shadow p-3 mb-5 bg-body rounded">Regular shadow</div>

<div class="shadow-lg p-3 mb-5 bg-body rounded">Larger shadow</div>