Transparent Form Drop form in color section background and font color change?

I can get this to work on the home page:

.home #av_section_1 .avia_ajax_form select{
background-color: #58442b;
opacity: 0.7;
color: #dfe2d9;
}

I am going nuts trying to figure our what to remove and replace to get this to work an any page by pasting av_section_1.

I really thought this would work but it obviously didn’t:

.av_section .avia_ajax_form select{
background-color: #58442b;
opacity: 0.7;
color: #dfe2d9;
}

What am I doing wrong and how do I get this to work any color section on any use the For Developers: Section ID?

Thank you for your help.