[ Origami theme] Nav in center page/change margin color

Hello, I’m kind of new to word press and alittle stuck. I am trying to create a Static page. The problem is I cannot get rid of the white content area. I have been editing the original theme instead of uploading a child theme (I’ve been having trouble with that also) and have adjusted the search bar width/length in the stylesheet to get a colored header look. Technically it isn’t the header, it’s more of the margin. It looks like this:

/* =Logo : Search Form
————————————————————– */

#logo #searchform {
position: absolute;
top: 0%;
right: 0;

margin-top: -95px;
}

#logo #searchform label {
display: none;
}

#logo #searchform #searchsubmit {
display: none;
}

#logo #searchform #s {
width: 1px;

background: #39c1cd url(http://i43.tinypic.com/29ekuc5.png) no-repeat 100px center;
border: 1px solid #EEEEEE;
border-width: 0 0 0px 0;
-moz-box-sizing: border-box;
-webkit-box-sizing: border-box;
box-sizing: border-box;
color: #777;
font-size: 0.9em;
font-weight: 200;
padding: 4px;
padding-left: 2000px;
-webkit-transition: all 0.275s ease-in-out;
-moz-transition: all 0.275s ease-in-out;
-o-transition: all 0.275s ease-in-out;
-ms-transition: all 0.275s ease-in-out;
transition: all 0.275s ease-in-out;
}

#logo #searchform #s:focus {
width: 180px;

}

And I also edited this:

/* This is the main page frame */

#page-container {
width: 100%;

background: #none;
border: 0px solid #cbc9c7;
-webkit-box-shadow: 0 0px 0px rgba(0,0,0,0.1);
-moz-box-shadow: 0 1px 0px rgba(0,0,0,0.1);
box-shadow: 0 0px 0px rgba(0,0,0,0.1), inset 0 0 0px rgba(0,0,0,0.1125);
-moz-box-sizing: border-box;
-webkit-box-sizing: border-box;
box-sizing: border-box;
margin: 70px 0 35px 0;
padding: .25% 4.5%;
}

/* =Logo

I couldn’t find anything to change the color so I basically stretched it. Now I want to add a static page too, but keep the colored header. I’m stuck right now. I really need a code for the colored margin and a code to put somewhere. Thought about trying to add a DIV and just cover it completely, but there has to be an easier way.

Here is a screenshot:

Here is a link to my current page: http://risachan.org.previewdns.com/