I wouldn't call the banner huge, at least not in the examples I've found at [1]. The cookie banner doesn't look out of the ordinary and hides when you start scrolling.
They may have changed the screenshots but I confirm that I received the same kind of email. Same technique and email from Google, the only difference was that it had some spam at the bottom of the email.
If I received an email from google with text formatted like this. I would automatically have doubts it's anythig genuine.
While Gmail isn't anything to boast about UI wise. Google often have good enough an consistent UI patterns where this screenshot looks like there was no thought put into it past slapping a google logo on top.
A small warning: I'm assuming you are going to use the regular tub in your bathroom. Please check the material and thickness first or at least be very careful.
We once broke a bathtub at a houseparty filling it with ice water + salt, to cool the drinks.
Quick-Tip v2: Please rethink the position of your discount and cookie-banner for the german page, it covers the links in your footer. Maybe put a bigger bottom-margin on the <body> that disappears on closing the banners. I shit you not, the law and lawyers are picky about that:
"...Mistakes can also occur in the placement of the "cookie banner": If the cookie banner e.g. covers the link to the imprint, the requirements of the Telemedia Act are not met. According to this, website operators must be identifiable for users. This is not the case if the user cannot reach the imprint directly and constantly, which would be the case with an overlaying cookie banner."
Quick-Tip: By german law, the link to your Data protection & Privacy policy needs to be visible and reachable in an unrestricted way. So please put the Datenschutzerklärung in the footer, before some lawyer sends you "The PayUs Letters".
I guess they edited the screenshot.