Each demo has own base style [root]/src/sass/demo/[demo_id]/style.scss that will be compiled and added into the demo's base css bundle assets/demo/[demo_id]/base/styles.bundle.css.

The demo's style.scss includes the entire framework stylesheets and compiles with its own layout and global settings that overrides's Metronic frameworks base global settings. Thus each demo can customize and change the look and feel of the the entire theme components by overriding global config [root]/src/sass/framework/_config.scss by the demo level config [root]/src/sass/demo/[demo_id]/_framework-config.scss.

Metronic uses nested map list to structure the config options with special custom function arrat-get() to access the nested config structure. Below is the example of the framework's base SASS config:

//
//** Global Config
//

//== Framework SASS Functions
@import "base/functions";

//== Layout Breakpoints
// Define the minimum and maximum dimensions at which your layout will change,
// adapting to different screen sizes, for use in media queries.
$m--layout-breakpoints: (
  	// Small screen / phone
  	sm: 576px,

  	// Medium screen / tablet
  	md: 768px,

  	// Large screen / desktop
  	lg: 992px,

  	// Extra large screen / wide desktop
  	xl: 1200px,

    // Extra large screen / wide desktop
    xxl: 1400px,

    xxxl: 1600px
) !default;

//== Global arrow style
$m--arrow-style: 'smooth'; // supported options: smooth, classic

//== Default skin
$m--default-skin: 'light'; // supported options: light, dark

//== Global rounded border mode
$m--rounded: true;

//== Force cursor with pointer for button tags globally
$m--btn-force-hover-pointer: true;

//== Border Radius
$m--border-radius: (
    general: 4px,
    dropdown: 6px,
    scrollbar: 2px
);

//== Transition
$m--transition: (
    general: all 0.3s,
    link: (
        hover: color .4s ease
    )
);

//== UI State Color
$m--state-colors: (
    // metronic states
    brand: (
        base: #716aca,
        inverse: #ffffff
    ),
    metal: (
        base: #c4c5d6,
        inverse: #111111
    ),
    light: (
        base: #ffffff,
        inverse: #282a3c
    ),
    accent: (
        base: #00c5dc,
        inverse: #ffffff
    ),
    focus: (
        base: #9816f4,
        inverse: #ffffff
    ),

    // bootstrap states
    primary: (
        base: #5867dd,
        inverse: #ffffff
    ),
    success: (
        base: #34bfa3,
        inverse: #ffffff
    ),
    info: (
        base: #36a3f7,
        inverse: #ffffff
    ),
    warning: (
        base: #ffb822,
        inverse: #111111
    ),
    danger: (
        base: #f4516c,
        inverse: #ffffff
    )
);

//== The body element font settings
$m--root-font: (
    size: (
        desktop: 14px,
        tablet: 13px,
        mobile: 13px
    ),
    weight: 300,
    color: (
        light: #333333,
        dark: #efefef
    )
);

//== Best font families
$m--font-families: (
    regular: 'Poppins',
    heading: 'Roboto'
);

//== General link font settings
$m--link-font: (
    default: (
        color: (
            light: get-brand-color(),
            dark: get-brand-color()
        )
    ),

    hover: (
        color: (
            light: get-brand-color('+'),
            dark: get-brand-color('+')
        )
    )
);
							
							

You can access to an option by using array-get() function as shown below:

$border-radius: array-get($m--border-radius, general); // 4px;
$brand-base-color: array-get($m--state-colors, brand, base); // #716aca
$brand-inverse-color: array-get($m--state-colors, brand, inverse); // #ffffff

You can use Metronic's globally available base mixins in your custom codes. All available mixins can be found here: src/sass/framework/base/_mixins.scss

You can use Metronic's globally available SASS functions in your custom codes. All available functions can be found here: src/sass/framework/base/_functions.scss