https://gazprom-mezhregiongaz-sankt-konnogvardejskij-bulvar.clients.site/

This XML file does not appear to have any style information associated with it. The document tree is shown below.

<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">

<url>

<loc>https://gazprom-mezhregiongaz-sankt-konnogvardejskij-bulvar.clients.site/</loc>

...

</url>

...

</urlset>