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Quickly customize Bootstrap with built-in variables to easily toggle global CSS preferences for controlling style and behavior.

Customize Bootstrap with our built-in custom variables file and easily toggle global CSS preferences with new $enable-* Sass variables. Override a variable’s value and recompile with npm run test as needed.

You can find and customize these variables for key global options in Bootstrap’s scss/_variables.scss file.

Variable Values Description
$spacer 1rem (default), or any value > 0 Specifies the default spacer value to programmatically generate our spacer utilities.
$enable-dark-mode true (default) or false Enables built-in dark mode support across the project and its components.
$enable-rounded true (default) or false Enables predefined border-radius styles on various components.
$enable-shadows true or false (default) Enables predefined decorative box-shadow styles on various components. Does not affect box-shadows used for focus states.
$enable-gradients true or false (default) Enables predefined gradients via background-image styles on various components.
$enable-transitions true (default) or false Enables predefined transitions on various components.
$enable-reduced-motion true (default) or false Enables the prefers-reduced-motion media query, which suppresses certain animations/transitions based on the users’ browser/operating system preferences.
$enable-grid-classes true (default) or false Enables the generation of CSS classes for the grid system (e.g. .row, .col-md-1, etc.).
$enable-container-classes true (default) or false Enables the generation of CSS classes for layout containers. (New in v5.2.0)
$enable-caret true (default) or false Enables pseudo element caret on .dropdown-toggle.
$enable-button-pointers true (default) or false Add “hand” cursor to non-disabled button elements.
$enable-rfs true (default) or false Globally enables RFS.
$enable-validation-icons true (default) or false Enables background-image icons within textual inputs and some custom forms for validation states.
$enable-negative-margins true or false (default) Enables the generation of negative margin utilities.
$enable-deprecation-messages true (default) or false Set to false to hide warnings when using any of the deprecated mixins and functions that are planned to be removed in v6.
$enable-important-utilities true (default) or false Enables the !important suffix in utility classes.
$enable-smooth-scroll true (default) or false Applies scroll-behavior: smooth globally, except for users asking for reduced motion through prefers-reduced-motion media query

` const jsSnippetContent = jsSnippet ? '\/\/ NOTICE!!! Initially embedded in our docs this JavaScript\n\/\/ file contains elements that can help you create reproducible\n\/\/ use cases in StackBlitz for instance.\n\/\/ In a real project please adapt this content to your needs.\n\/\/ \u002b\u002b\u002b\u002b\u002b\u002b\u002b\u002b\u002b\u002b\u002b\u002b\u002b\u002b\u002b\u002b\u002b\u002b\u002b\u002b\u002b\u002b\u002b\u002b\u002b\u002b\u002b\u002b\u002b\u002b\u002b\u002b\u002b\u002b\u002b\u002b\u002b\u002b\u002b\u002b\u002b\u002b\n\n\/*!\n * JavaScript for Bootstrap\u0027s docs (https:\/\/getbootstrap.com\/)\n * Copyright 2011-2024 The Bootstrap Authors\n * Licensed under the Creative Commons Attribution 3.0 Unported License.\n * For details, see https:\/\/creativecommons.org\/licenses\/by\/3.0\/.\n *\/\n\n\/* global bootstrap: false *\/\n\n(() =\u003e {\n \u0027use strict\u0027\n\n \/\/ --------\n \/\/ Tooltips\n \/\/ --------\n \/\/ Instantiate all tooltips in a docs or StackBlitz\n document.querySelectorAll(\u0027[data-bs-toggle=\u0022tooltip\u0022]\u0027)\n .forEach(tooltip =\u003e {\n new bootstrap.Tooltip(tooltip)\n })\n\n \/\/ --------\n \/\/ Popovers\n \/\/ --------\n \/\/ Instantiate all popovers in docs or StackBlitz\n document.querySelectorAll(\u0027[data-bs-toggle=\u0022popover\u0022]\u0027)\n .forEach(popover =\u003e {\n new bootstrap.Popover(popover)\n })\n\n \/\/ -------------------------------\n \/\/ Toasts\n \/\/ -------------------------------\n \/\/ Used by \u0027Placement\u0027 example in docs or StackBlitz\n const toastPlacement = document.getElementById(\u0027toastPlacement\u0027)\n if (toastPlacement) {\n document.getElementById(\u0027selectToastPlacement\u0027).addEventListener(\u0027change\u0027, function () {\n if (!toastPlacement.dataset.originalClass) {\n toastPlacement.dataset.originalClass = toastPlacement.className\n }\n\n toastPlacement.className = \u0060${toastPlacement.dataset.originalClass} ${this.value}\u0060\n })\n }\n\n \/\/ Instantiate all toasts in docs pages only\n document.querySelectorAll(\u0027.bd-example .toast\u0027)\n .forEach(toastNode =\u003e {\n const toast = new bootstrap.Toast(toastNode, {\n autohide: false\n })\n\n toast.show()\n })\n\n \/\/ Instantiate all toasts in docs pages only\n \/\/ js-docs-start live-toast\n const toastTrigger = document.getElementById(\u0027liveToastBtn\u0027)\n const toastLiveExample = document.getElementById(\u0027liveToast\u0027)\n\n if (toastTrigger) {\n const toastBootstrap = bootstrap.Toast.getOrCreateInstance(toastLiveExample)\n toastTrigger.addEventListener(\u0027click\u0027, () =\u003e {\n toastBootstrap.show()\n })\n }\n \/\/ js-docs-end live-toast\n\n \/\/ -------------------------------\n \/\/ Alerts\n \/\/ -------------------------------\n \/\/ Used in \u0027Show live alert\u0027 example in docs or StackBlitz\n\n \/\/ js-docs-start live-alert\n const alertPlaceholder = document.getElementById(\u0027liveAlertPlaceholder\u0027)\n const appendAlert = (message, type) =\u003e {\n const wrapper = document.createElement(\u0027div\u0027)\n wrapper.innerHTML = [\n \u0060\u003cdiv class=\u0022alert alert-${type} alert-dismissible\u0022 role=\u0022alert\u0022\u003e\u0060,\n \u0060 \u003cdiv\u003e${message}\u003c\/div\u003e\u0060,\n \u0027 \u003cbutton type=\u0022button\u0022 class=\u0022btn-close\u0022 data-bs-dismiss=\u0022alert\u0022 aria-label=\u0022Close\u0022\u003e\u003c\/button\u003e\u0027,\n \u0027\u003c\/div\u003e\u0027\n ].join(\u0027\u0027)\n\n alertPlaceholder.append(wrapper)\n }\n\n const alertTrigger = document.getElementById(\u0027liveAlertBtn\u0027)\n if (alertTrigger) {\n alertTrigger.addEventListener(\u0027click\u0027, () =\u003e {\n appendAlert(\u0027Nice, you triggered this alert message!\u0027, \u0027success\u0027)\n })\n }\n \/\/ js-docs-end live-alert\n\n \/\/ --------\n \/\/ Carousels\n \/\/ --------\n \/\/ Instantiate all non-autoplaying carousels in docs or StackBlitz\n document.querySelectorAll(\u0027.carousel:not([data-bs-ride=\u0022carousel\u0022])\u0027)\n .forEach(carousel =\u003e {\n bootstrap.Carousel.getOrCreateInstance(carousel)\n })\n\n \/\/ -------------------------------\n \/\/ Checks \u0026 Radios\n \/\/ -------------------------------\n \/\/ Indeterminate checkbox example in docs and StackBlitz\n document.querySelectorAll(\u0027.bd-example-indeterminate [type=\u0022checkbox\u0022]\u0027)\n .forEach(checkbox =\u003e {\n if (checkbox.id.includes(\u0027Indeterminate\u0027)) {\n checkbox.indeterminate = true\n }\n })\n\n \/\/ -------------------------------\n \/\/ Links\n \/\/ -------------------------------\n \/\/ Disable empty links in docs examples only\n document.querySelectorAll(\u0027.bd-content [href=\u0022#\u0022]\u0027)\n .forEach(link =\u003e {\n link.addEventListener(\u0027click\u0027, event =\u003e {\n event.preventDefault()\n })\n })\n\n \/\/ -------------------------------\n \/\/ Modal\n \/\/ -------------------------------\n \/\/ Modal \u0027Varying modal content\u0027 example in docs and StackBlitz\n \/\/ js-docs-start varying-modal-content\n const exampleModal = document.getElementById(\u0027exampleModal\u0027)\n if (exampleModal) {\n exampleModal.addEventListener(\u0027show.bs.modal\u0027, event =\u003e {\n \/\/ Button that triggered the modal\n const button = event.relatedTarget\n \/\/ Extract info from data-bs-* attributes\n const recipient = button.getAttribute(\u0027data-bs-whatever\u0027)\n \/\/ If necessary, you could initiate an Ajax request here\n \/\/ and then do the updating in a callback.\n\n \/\/ Update the modal\u0027s content.\n const modalTitle = exampleModal.querySelector(\u0027.modal-title\u0027)\n const modalBodyInput = exampleModal.querySelector(\u0027.modal-body input\u0027)\n\n modalTitle.textContent = \u0060New message to ${recipient}\u0060\n modalBodyInput.value = recipient\n })\n }\n \/\/ js-docs-end varying-modal-content\n\n \/\/ -------------------------------\n \/\/ Offcanvas\n \/\/ -------------------------------\n \/\/ \u0027Offcanvas components\u0027 example in docs only\n const myOffcanvas = document.querySelectorAll(\u0027.bd-example-offcanvas .offcanvas\u0027)\n if (myOffcanvas) {\n myOffcanvas.forEach(offcanvas =\u003e {\n offcanvas.addEventListener(\u0027show.bs.offcanvas\u0027, event =\u003e {\n event.preventDefault()\n }, false)\n })\n }\n})()\n' : null const project = { files: { 'index.html': markup, 'index.js': jsSnippetContent }, title: 'Bootstrap Example', description: `Official example from ${window.location.href}`, template: jsSnippet ? 'javascript' : 'html', tags: ['bootstrap'] } StackBlitzSDK.openProject(project, { openFile: 'index.html' }) }