app/assets/stylesheets/utils/_colors.scss
// Color style guide:
// * Never hard-code colors, always use a variable
$black: #151514;
$white: #ffffff;
// greens
$primary-green: #186bb7;
$bootstrap-green: #f2dede;
// reds
$bootstrap-red: #dff0d8;
$error-red: #b94a48;
// greys
$grey-40: #899096;
$light-gray: #ccc;