style template show page

db/migrate/20230519144036_create_submissions.rb

@@ -4,6 +4,7 @@ class CreateSubmissions < ActiveRecord::Migration[7.0]
   def change
     create_table :submissions do |t|
       t.references :template, null: false, foreign_key: true, index: true
+      t.references :created_by_user, null: true, foreign_key: { to_table: :users }, index: true
 
       t.datetime :deleted_at