bootstrap.min.css

File: /wp-content/themes/Automotive/css/bootstrap.min.css

Line: Got to search for it (this file is a cluster derp). Note: bootstrap.min.css is the minified css for twitter bootstrap. You can download the dev version at getbootstrap.com.
.navbar-default .navbar-brand:focus{color:#5e5e5e;background-color:#c7081b} -> .navbar-default .navbar-brand:focus{color:#5e5e5e;background-color:transparent}