embedded form formatting?

embedded form formatting?

I am trying to get the formatting of my form to match that of my website.  I used the following to get most issues resolved but still had a couple problems:
https://www.zoho.com/creator/help/url-pattern/style-based-urls-for-embedded-forms.html#3._Form_Footer_Customization

1)  I cant seem to change the color of the background or font of dropdown fields so that the users selection shows up.  The font is always black which doesn't work on a black background.  I can change the font and background on all other fields without a problem.  See pic1

2)  The data entry required error messages show up with white background.  Is there anyway to change the background color on these?  See pic 2

3)  There is a white line just above the submit and reset buttons I cant seem to get rid of.  Is there anyway to change the color of this or hide it.  See pic 1 or pic 2

Any help would be appreciated
Thanks!
Brent