SVG inline

Simply copy/paste this into your HTML:

<svg class="humbleicons hi-brand-facebook" xmlns="http://www.w3.org/2000/svg" width="24" height="24" fill="none" viewBox="0 0 24 24"><path stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 21a9 9 0 1 0 0-18 9 9 0 0 0 0 18Zm0 0V10a2 2 0 0 1 2-2h1m-.5 4.5h-5"/></svg>

SVG sprite

Download the sprite file and address the icon by its slug:

<svg class="humbleicons"><use xlink:href="humbleicons.svg#brand-facebook"/></svg>