AM isn't fronting and I don't know what font it used so I will just give you the code:

@font-face { font-family: 『**FONT NAME**』; src: url(/api/util/ext/image?img=『**PUT LINK HERE**』); }

body { font-family: 『**FONT NAME**』 !important; font-size: 15px !important; }

Hope this helps. Upload a font TTF file using Catbox.