ASP .Net Core Problem with Unity

1:

step1: Create new ASP .NET CORE by "dotnet new MVC";

step2: Create .exe by "dotnet publish -r win-x64 -c Release /p:PublishSingle=true /p:PublishTrimmed=true";

step3: The Web Page Style is missing when i log into "https://localhost:5001"(Starting the local server with the .exe);

However ,when i log the page by  order "dotnet watch run" is completely no problem.

how can i deal with the problem to fix missing page style ?

2: I wanna to use the .dll (made by the ASP .Net Core) in Unity ,how can i do ?

i used to put the .dll (order : "dotnet build ",location: bin/Debug/netcoreapp3.1/... .dll) into the Unity(Asset/Plugins/)

but it throw exception as :

"Unable to resolve reference 'Microsoft.AspNetCore.Mvc.Core'. Is the assembly missing or incompatible with the current platform?
Reference validation can be disabled in the Plugin Inspector."

if somebody can help me ,thanks much