Problem with showing up icons on phones

Basically I successfully changed the default icons in habpanel when accessing it with my laptop but when I try to open habpanel on my phone, I couldn’t see any change as you can see

You might need to look into when to use svg / png icons, and the default settings in PaperUI (I think the defaults don’t affect habpanel, but you might want them matching if you ever use a sitemap UI)