app/assets/stylesheets/bootstrap-overrides.scss
// Custom Bootstrap Overrides
// Note: Only override variables as needed. Don't include variables if the value is the bootstrap default.
// https://github.com/twbs/bootstrap-sass/blob/master/assets/stylesheets/bootstrap/_variables.scss
$bright-red: #e62911;
$dark-red: darken($bright-red, 5%);
$navbar-height: 58px !default;
$navbar-inverse-link-color: #fff !default;
$navbar-inverse-bg: $bright-red !default;
$navbar-inverse-link-hover-bg: $dark-red !default;
$navbar-inverse-toggle-hover-bg: $dark-red !default;
$navbar-inverse-toggle-border-color: $dark-red !default;