Change Navbar Header Size

Current Header is 1877 x 92

Would like to make it 1877 x 183px

Please explain what code I need for custom CSS. (I am not a coder)

This is a mock-up for a site I am working on.
http://cp-web-design.com/wp/category/press/

thanks.

Below is from “Inspect Element”

<header class=”navbar navbar-fixed-top siteHeader” style=”top: 32px;”>
<div class=”container”>
<div class=”navbar-header”>
<button type=”button” class=”navbar-toggle” data-toggle=”collapse” data-target=”#navbar-ex-collapse”>
<span class=”sr-only”>Toggle navigation</span>
<span class=”icon-bar”></span>
<span class=”icon-bar”></span>
<span class=”icon-bar”></span>
</button>
<h1 class=”navbar-brand headLogo”>