How can I change the background color to white or transparent on this form?

I am trying to change the background color from black to white or transparent.  I have tried doing it in the designer, but to no avail.  Please let me know what I am doing wrong to make this change.  Also, I want to change the color of the green. How do I do this. 

Hi,

There was a bit of CSS that was, I believe, added by a previously applied theme.  First, to set the frame background to clear, open the form designer, click on the background tab, then "Frame" then click on the large "X" to clear the background:

Then to remove the CSS that is overwriting the clear background, click on the CSS tab, then click on the frame background(make sure that .form-section is the part of the form you altering:

Then remove the highlighted section of code.  After that, your form should be clear:

For the background of the submit button, click on the CSS tab, click on the submit button, then remove this block of code:

The top information I believe you may have to change the that completely as the background is an image.