Making an inactive submit button

I am making a form as a type of passcode so that when the user enters the correct word into a text box, it shows the submit button. I can get this working no problem by using conditional formatting.

However at the moment there is a blank space where the submit button should be until the user enters the correct word. I was wondering is there any css that I can input to make another submit button inactive as a kind of placeholder? this will then be switched with the active button when the correct word is entered.

So in short, is there css I can use to remove the click action of a submit button