Changing the background color of the bar where the submit button is

Also, the submit bar is locked in its current format. We dont want it to be blue. Can you change this to grey?

You are referring to this element right?

Please inject this custom CSS code:

li[data-type=control_button] {
background: #d3d3d3 !important;
}

Here's a guide on how to add this custom CSS code.  Thank you.