How to change WEB UI OpenVPN CWS?

Question

linux

We raised OpenVPN, but you need to change its WEB UI for yourself.
Naturally, we are aware that there are the following commands:

Открыть файл конфигурации - nano /usr/local/openvpn_as/etc/as.conf
Наименование компании H1 - sa.company_name=OpenVPN Inc.
Логотип - sa.logo_image_file=/usr/local/openvpn_as/companylogo.png

But I would like to understand where the change of the entire HTML page is located. And everything else.