help, menu buttons not working on mobile

Greetings,
I need help. We had a white background as our header and my boss wanted to change it to blue. I found a section where you can use Custom css and change it to blue. It worked great but now I’m having issues with the menu and also blue covering up the picture on the other pages. Any help will be greatly appreciated.

William Dunlap
🙂
Here is my website:
http://www.hollomanfss.com/FSS

this is the CSS style I’ve been using.

#content-inner { overflow: hidden; }
#header { position: relative; z-index: 1 }
div#header:before {
content: ” “;
position: absolute;
top: -50px;
left: -50px;
height: 200%;
width: 200%;
z-index: -1;
background: #203b72;
visibility: visible;
overflow: hidden;
}

I would also like to know how to change the FACEBOOK icon to white like:

http://www.lakenheathfss.com/