Simple error templates for Craft CMS 3 & 4 - styled with zero dependencies.
Simply copy the error.twig and offline.twig files in to your Craft CMS templates directory and edit the contact details, copy, colours and logo.
Simply edit the CSS properties at the top of each file to match your branding.
You can simply replace the inline SVG or switch it to an image tag and use the same CSS class.
These templates have only been tested with Craft CMS 3 and Craft CMS 4