add customization docs (#507)

Author: abracchi-tw

products/access/src/content/authentication/login-page.md

@@ -4,7 +4,12 @@ order: 1
 
 # Login customization
 
-In the **Authentication > Login** tab, you can customize the login process for your end users.
+The **Authentication > Login** tab lets you customize your end users' login experience, so that it meets your organization's needs. 
+
+This means you can:
+* Choose your preferred [login methods](#login-methods)
+* Specify your [auth domain](#auth-domain)
+* Customize your [login page](#login-page)
 
 ## Login methods
 
@@ -14,20 +19,24 @@ Use the **Login Methods** card to add new login methods, or edit/test any login
 
 ## Auth domain
 
-Use the **Auth domain** card to edit your auth domain. To do so, click Edit and input your desired domain name.
+Use the **Auth domain** card to edit your auth domain. To do so, click **Edit** and input your desired domain name.
 
  This domain is shared across all sites in your Cloudflare account where you have configured Access.
 
 ![Auth Domain](../static/app-launch/auth-domain.png)
 
 ## Login page
 
-Use the **Login Page** card to customize the login page your end users will see. To do so, click *Customize*.
+Use the **Login Page** card to customize the login page your end users will see. To do so, click **Customize**.
 
 This will allow you to add an organization name, a custom header and footer, a logo, and a preferred background color to your login page.
 
 ![Login Customize Card](../static/app-launch/customize-login-card.png)
 
+Any changes you make will be reflected in real time in the **Preview** card.
+
+![Preview Card](../static/app-launch/preview-card-login.png)
+
 Once you’re satisfied with your customization, click **Save**.
 
 Your login page will now reflect your changes.