Struggling with adding fonts

Hi everybody, I'm a graphic designer with NO CSS knowledge. For an interactive infographic I have to add the customer's typeface and it just doesn't work. I can install ONE custom font and that one works (so I seem to have basically understood what I have to do), but when I want to add further fonts, they simply don't work. Can anyone help me, please?

The fonts I need are all in the resources folder.

Only the Bold typeface works; the other three don't

one thing i can see:
you have two opening style-tags instead of open <-> close


Hans-Gerd, you made my day! That tiny little thing was exactly what was wrong. Now it works. Thank you so much!! :heart: