Alright, now I think I get what you’re after.
These things are not envisaged in the theme originally, yet the extra code is quite straightforward so here goes:
#post-391 { background-color: transparent !important; }
#header #header-box { background: none !important; }
#nav-wrap { float: none; background-color: #82C341; }
Please let me know if it works as intended.
Sincerely,
Andrii / Satori Studio