How to configure DbContext properly in WebAPI 3-Tier architecture?

Question

I'm trying to create a project in WebAPI using 3-Tier architecture and I want to add a database using the EntityFramework code first. As I understand, I need to add my datacontext into WebAPi project, Startup.cs since I always get the exception that DbContext is not configured.

 public void ConfigureServices(IServiceCollection services)
        {
            services.AddControllers();
            services.AddDbContext<DatabaseContext>();
        }

And seems like it ruins the architecture because I need to add using DataAccess to connect my DbContext. Am I right and if so, how to connect my DBContext properly?

DatabaseContext.cs

namespace Data.Context
{
    public class DatabaseContext : DbContext
    {
        public class OptionsBuild
        {
            public OptionsBuild()
            {
                settings = new AppConfiguration();
                optionsBuilder = new DbContextOptionsBuilder<DatabaseContext>();
                optionsBuilder.UseSqlServer(settings.SqlConnectionString);
                databaseOptions = optionsBuilder.Options;
            }
            public DbContextOptionsBuilder<DatabaseContext> optionsBuilder { get; set; }
            public DbContextOptions<DatabaseContext> databaseOptions { get; set; }
            private AppConfiguration settings { get; set; }
        }

        public static OptionsBuild options = new OptionsBuild();

        public DatabaseContext() { }
        public DatabaseContext(DbContextOptions<DatabaseContext> options) : base(options) { }

        public DbSet<UserEntity> UserEntities { get; set; }
        public DbSet<RoleEntity> RoleEntities { get; set; }
        public DbSet<TestEntity> TestEntities { get; set; }
    }
}

I guess that I provided not enough code for you to answer. If so, please tell me what to add because I don't really know what is going to be helpful. Thanks in advance!