title: Creating a custom error page in Umbraco CMS
body: <p>I'm working on a client site who is using Umbraco as a CMS. I need to create a custom 404 error page. I've tried doing it in the IIS config but umbraco overrides that. </p>
  
  <p>Does anyone know how to create a custom 404 error page in Umbraco?
  Is there a way to create a custom error page for runtime errors?</p>