What does $theme-colors do in Bootstrap?

$theme-colors lists all semantically named theme colors (shown below) Within scss/_variables.scss, you’ll find Bootstrap’s color variables and Sass map. Here’s an example of the $colors Sass map: Add, remove, or modify values within the map to update how they’re used in many other components.

Is Bootstrap supported by a color system?

Bootstrap is supported by an extensive color system that themes our styles and components. This enables more comprehensive customization and extension for any project.

How do I change the text color in Bootstrap 4?

The bootstrap 4 documentation lists this under utilities -> color, and has more options: primary, secondary, success, danger, warning, info, light, dark, muted, white. So, if I want the primary text color for example I would do something like this:

How to color a navigation bar in Bootstrap?

The text at the navigation bar is normally colored by using one of the two following css classes in the bootstrap.css file. Firstly, in case of using a default navigation bar (the gray one), the .navbar-default class will be used and the text is colored as dark gray.