better branded block response

having better customization for the blocked sites, ie options to toggle or even provide a html file/ template to use and edit. the txt "this website is blocked" is very annoying too, please add a way to remove it/ customize.
having a preview button beside/ near the save button to quickly preview what the changes looks like. additionally, for example, the ads "tiles' beside the websites can and will be all sorts of sizes/ dimensions, having a quick preview button can simplify the process by a lot.
browsers on my phone although shows the branded block messages on the ads tiles, it also shows that the connection isnt secured, while often times it just wouldnt show to branded blocked response, especially on pc.