Logging in Identity Server 4 - .Net Core 2.2

I am trying to enable logging in Identity Server 4 by following their guide in the docs that uses Serilog. Not sure if the docs are out of date but there are two extension methods .UseSerilog() and .Build() from CreateWebHostBuilder() that throw an error, though I have the Serilog package installed:

public static void Main(string[] args)
        {
            Console.Title = "IdentityServer4.Postgres";

            Log.Logger = new LoggerConfiguration()
            .MinimumLevel.Debug()
            .MinimumLevel.Override("Microsoft", LogEventLevel.Warning)
            .MinimumLevel.Override("System", LogEventLevel.Warning)
            .MinimumLevel.Override("Microsoft.AspNetCore.Authentication", LogEventLevel.Information)
            .Enrich.FromLogContext()
            .WriteTo.Console(outputTemplate: "[{Timestamp:HH:mm:ss} {Level}] {SourceContext}{NewLine}{Message:lj}{NewLine}{Exception}{NewLine}", theme: AnsiConsoleTheme.Literate)
            .CreateLogger();

            var seed = args.Contains("/seed");
            if (seed)
            {
                args = args.Except(new[] { "/seed" }).ToArray();
            }

            var host = CreateWebHostBuilder(args).Build();

            if (seed)
            {
                var config = host.Services.GetRequiredService<IConfiguration>();
                var connectionString = config.GetConnectionString("DefaultConnection");
                SeedData.EnsureSeedData(connectionString);
                return;
            }

            host.Run();
        }

        public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
            WebHost.CreateDefaultBuilder(args)
                .UseStartup<Startup>()
                .UseSerilog()
                .Build();
    }

Update