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Bootstrap's CSS is built on Less, a preprocessor with additional functionality like variables, mixins, and functions for compiling CSS. Those looking to use the source Less files instead of our compiled CSS files can make use of the numerous variables and mixins we use throughout the framework.

##### Grayscale

Grayscale colors provide quick access to commonly used shades of black while semantic include various colors assigned to meaningful contextual values.

##### Default Colors

Use any of these color variables as they are or reassign them to more meaningful variables for your project.

##### Custom Colors

Different colors used especially in charts, graphs and custom configurations for different buttons, panels, or sliders.

Navbar Options

Show/Hide Fixed

Header Layout

Show/Hide

Sidebar Options

Show/Hide
Fixed Aside

Content View

Footer Options

Show/Hide Fixed

Main Color

Primary
Info
Success
Warning
Danger

Navbar

Dark
Light
Like Main Color

Sidebar

Dark
Light
Like Main Color