You can configure each realm to show a custom Consent page.
The following section describes how you can create your own Plugin which will be invoked to determine the consent page

Consent Page

An apex class which implements the standard Salesforce Callable and handles an action get:consent:page.
The action will be passed the following parameters
request : Map<String, Object> : The request parameters
user : Id : The Salesforce SObject Id for the user for whom the authentication is requested
The expected return is a String which is the URL for the page where the user should be redirected to complete her consent. If the returned value is null, the user flow will continue to the standard CYM Identity Consent page

Example :

MyOIDCProviderCallable.cls
1global class MyOIDCProviderCallable implements Callable {
2 global Object call(String action, Map<String, Object> args) {
3 if (action == 'get:consent:page') {
4 return '/consent';
5 }
6 return null;
7 }
8}