"that was not so hard"

I have not said this line. but seems mistyped 'bar' to 'bard' i fixed it.
I mean this was the button not the bar.

I have changed title to How can I remove the green create an account button in white theme

Hi,

I'm not sure what you mean by 'that was not so hard'?
Understood about the html now too. Thank you.

This was not a bar so I am changing your question title, this is signup button. It seems its become a bar after you changed the text but its a button.

You can not use html codes in input type buttons/submits that is the reason. Now this is a common rule no one can change.

Here is a screen shot showing before adding html code and after.
As can be seen, the html displays correctly at the top but not at the bottom, in the green bar.

Can you please provide us screenshot? there is no green bar in white theme I remember.

What green bar please share screenshot