SVG inline

Simply copy/paste this into your HTML:

<svg class="humbleicons hi-certificate-off" 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="m4 4 16 16M6.831 7.366a2.021 2.021 0 0 0 0 3.268l.444.323-.085.542A2.021 2.021 0 0 0 9.5 13.81l.543-.085.323.444a2.022 2.022 0 0 0 3.268 0M9 17v4l3-2 3 2v-2.5M8 4.55c.412-.3.94-.448 1.5-.36l.543.085.323-.444a2.022 2.022 0 0 1 3.268 0l.323.444.542-.085A2.021 2.021 0 0 1 16.81 6.5l-.085.543.444.323a2.022 2.022 0 0 1 0 3.268l-.444.323.085.542c.088.56-.06 1.089-.36 1.501"/></svg>

SVG sprite

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

<svg class="humbleicons"><use xlink:href="humbleicons.svg#certificate-off"/></svg>