Import the CSS file:
<link
rel="stylesheet"
href="https://cdn.jsdelivr.net/gh/iconoir-icons/iconoir@main/css/iconoir.css"
/>
Here is an example in HTML:
<i class="iconoir-hand-brake"></i>
The class must always be "iconoir-" and then the name of the icon. You can find the names of the icons here.
The icons are display: inline-block and default to the current font size. You can control this by adjusting the ::before styles of the element (which is where the icons are added as a mask).