Unfortunately, the favicon color cannot be dynamically changed using CSS classes or styles applied in the HTML because the browser renders the favicon as a standalone image resource, separate from the DOM. To change the color of a FontAwesome icon used as a favicon, you need to modify the SVG file itself.

Most CDNs, including FontAwesome, serve their SVGs in a default black color or without color. They don’t provide dynamic color customization. However, you can: Search for services that allow color customization in SVGs dynamically (though these are rare and usually not free). Tools like SVGOMG or similar SVG editors let you upload and edit SVG files.