More CSS simplification

Edit domain names, updates credentials and virtuals
Model domain tests for length and valid characters

app/models/domain.rb

@@ -5,6 +5,7 @@ class Domain < ApplicationRecord
     has_many :virtuals, dependent: :destroy
     validates :domain, presence: true
     validates :domain, uniqueness: true
+    validates :domain, format: { with: /\A(((?!-))(xn--|_)?[a-z0-9-]{0,61}[a-z0-9]{1,1}\.)*(xn--)?([a-z0-9][a-z0-9\-]{0,60}|[a-z0-9-]{1,30}\.[a-z]{2,})\z/, message: "domain not valid" }
 
     private
         def create_abuse_postmaster