These files are the unmodified player pages of the RO3Emu web panel
(src/Ro3Emu.Panel/www at the RO3: Abyss server commit bbcce0dc), licensed GPL-3.0 (LICENSE-GPL-3.0.txt).
The RO3: Abyss theme on top of them is /assets/css/panel-abyss.css.
Source: available from the RO3: Abyss team on request (GPL-3.0 section 6).