For general installation and configuration take a look at the components package.
If you use width !== full you are able to overwrite the max-width with --db-drawer-max-width: CSS variable.
<!-- index.html -->
...
<body>
<dialog class="db-drawer" data-backdrop="true" open>
<article class="db-drawer-container">
<header class="db-drawer-header">
<button
class="db-button button-close-drawer is-icon-text-replace"
data-icon="cross"
data-variant="ghost"
>
Close Button
</button>
</header>
<div class="db-drawer-content">My Drawer content</div>
</article>
</dialog>
</body>