Recently, I was asked to hide the "Cancel" button on a Nintex Form.
Using the Internet Explorer Development Tools (F12), I identified the Cancel button element.
It was necessary for me to use the element id (because the class is used multiple times in the form), so I inserted the following to CSS on the form.
Unfortunately this didn't work.
After some research I realized the periods in the element id name are not recognized by CSS and need to be escaped.
Adding a slash (\) in front of each period did the trick.