According to my search, CSHTML is an extension used by Razor, an ASP.NET view engine that generates webpages. Unfortunately, ASP.NET is not available on free hosting:
You would have to upload the produced HTML files (with an .html extension) for your website to work, as the server won’t be able to execute C# code or display .cshtml files as you likely intend them to be.
By the way, your website seems to redirect me to an ad page right now, no idea what’s up with that.