Table of Contents

About

This is an advanced CSS topic that you can use while creating your theme.

You can set CSS variables:

How to customize CSS Variables?

If you want to customize Bootstrap CSS Variables or add your own, they are in the partial head-partials.hbs.

Combostap uses them when you change the branding colors.

Example: 

{{#if primary-color}}
    <style>
        :root {
            --bs-primary: {{primary-color}};
        }
        .btn-primary {
            --bs-btn-bg: {{primary-color}};
            --bs-btn-border-color: {{primary-color}};
        }
    </style>
{{/if}}

Bootstrap CSS Variables

Bootstrap allows customizing its stylesheet via its own CSS variables (from version 5.1)

It offers CSS variables:

  • on the root
  • and for each component

Root variables

:root {
    --bs-blue: #0d6efd;
    --bs-indigo: #6610f2;
    --bs-purple: #6f42c1;
    --bs-pink: #d63384;
    --bs-red: #dc3545;
    --bs-orange: #fd7e14;
    --bs-yellow: #ffc107;
    --bs-green: #198754;
    --bs-teal: #20c997;
    --bs-cyan: #0dcaf0;
    --bs-black: #000;
    --bs-white: #fff;
    --bs-gray: #6c757d;
    --bs-gray-dark: #343a40;
    --bs-gray-100: #f8f9fa;
    --bs-gray-200: #e9ecef;
    --bs-gray-300: #dee2e6;
    --bs-gray-400: #ced4da;
    --bs-gray-500: #adb5bd;
    --bs-gray-600: #6c757d;
    --bs-gray-700: #495057;
    --bs-gray-800: #343a40;
    --bs-gray-900: #212529;
    --bs-primary: #0d6efd;
    --bs-secondary: #6c757d;
    --bs-success: #198754;
    --bs-info: #0dcaf0;
    --bs-warning: #ffc107;
    --bs-danger: #dc3545;
    --bs-light: #f8f9fa;
    --bs-dark: #212529;
    --bs-primary-rgb: 13,110,253;
    --bs-secondary-rgb: 108,117,125;
    --bs-success-rgb: 25,135,84;
    --bs-info-rgb: 13,202,240;
    --bs-warning-rgb: 255,193,7;
    --bs-danger-rgb: 220,53,69;
    --bs-light-rgb: 248,249,250;
    --bs-dark-rgb: 33,37,41;
    --bs-white-rgb: 255,255,255;
    --bs-black-rgb: 0,0,0;
    --bs-body-color-rgb: 33,37,41;
    --bs-body-bg-rgb: 255,255,255;
    --bs-font-sans-serif: system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue","Noto Sans","Liberation Sans",Arial,sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol","Noto Color Emoji";
    --bs-font-monospace: SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier New",monospace;
    --bs-gradient: linear-gradient(180deg, rgba(255, 255, 255, 0.15), rgba(255, 255, 255, 0));
    --bs-body-font-family: var(--bs-font-sans-serif);
    --bs-body-font-size: 1rem;
    --bs-body-font-weight: 400;
    --bs-body-line-height: 1.5;
    --bs-body-color: #212529;
    --bs-body-bg: #fff;
    --bs-border-width: 1px;
    --bs-border-style: solid;
    --bs-border-color: #dee2e6;
    --bs-border-color-translucent: rgba(0, 0, 0, 0.175);
    --bs-border-radius: 0.375rem;
    --bs-border-radius-sm: 0.25rem;
    --bs-border-radius-lg: 0.5rem;
    --bs-border-radius-xl: 1rem;
    --bs-border-radius-2xl: 2rem;
    --bs-border-radius-pill: 50rem;
    --bs-link-color: #0d6efd;
    --bs-link-hover-color: #0a58ca;
    --bs-code-color: #d63384;
    --bs-highlight-bg: #fff3cd;
}

Components Variables

The CSS Variables are (from version 5.2) scoped to the component

Example for a primary button 

.btn-primary {
    --bs-btn-color: #fff;
    --bs-btn-bg: #0d6efd;
    --bs-btn-border-color: #0d6efd;
    --bs-btn-hover-color: #fff;
    --bs-btn-hover-bg: #0b5ed7;
    --bs-btn-hover-border-color: #0a58ca;
    --bs-btn-focus-shadow-rgb: 49,132,253;
    --bs-btn-active-color: #fff;
    --bs-btn-active-bg: #0a58ca;
    --bs-btn-active-border-color: #0a53be;
    --bs-btn-active-shadow: inset 0 3px 5px rgba(0, 0, 0, 0.125);
    --bs-btn-disabled-color: #fff;
    --bs-btn-disabled-bg: #0d6efd;
    --bs-btn-disabled-border-color: #0d6efd;
}
.btn {
    --bs-btn-padding-x: 0.75rem;
    --bs-btn-padding-y: 0.375rem;
    --bs-btn-font-family: ;
    --bs-btn-font-size: 1rem;
    --bs-btn-font-weight: 400;
    --bs-btn-line-height: 1.5;
    --bs-btn-color: #212529;
    --bs-btn-bg: transparent;
    --bs-btn-border-width: 1px;
    --bs-btn-border-color: transparent;
    --bs-btn-border-radius: 0.375rem;
    --bs-btn-hover-border-color: transparent;
    --bs-btn-box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.15),0 1px 1px rgba(0, 0, 0, 0.075);
    --bs-btn-disabled-opacity: 0.65;
    --bs-btn-focus-box-shadow: 0 0 0 0.25rem rgba(var(--bs-btn-focus-shadow-rgb), .5);
}