A starter boilerplate based on the ITCSS (Inverted Triangle CSS) methodology.
ITCSS is a mobile-first, responsive, battle-tested CSS framework based on the ITCSS methodology utilizing the BEM methodology.
This boilerplate is intented to be used as a starting point in your application. You should use this as a foundation for your CSS and build on top of it.
If you want to use the full capabilities of this boilerplate such as variables, mixins, etc., then you should include it in your PostCSS files.
You should also install the required PostCSS plugins and configure your PostCSS environment following the configuration file here
You can also use the build which is plain CSS but lacks mixins, custom media queries and other useful tools.
# Via NPM
npm i itcss
# Via Yarn
yarn add itcssIf you are using a module bundler (such as Webpack, Parcel, Browserify):
# In your CSS entrypoint
@import 'itcss';
# Or if the above does not resolve, try
@import 'itcss/index.css';There are several predefined variables which you can overwrite:
:root {
/* Color Variables */
--color-base: #333;
--color-primary: #fff;
--color-secondary: #000;
--color-action: #ef4c23;
/* Text Variables */
--font-sans-serif: sans-serif;
--font-serif: serif;
--font-monospace: monospace;
--font-size-base: 1rem;
--line-height-base: 1.35;
--font-size-h1: 2rem;
--font-size-h2: 1.75rem;
--font-size-h3: 1.5rem;
--font-size-h4: 1.25rem;
--font-size-h5: var(--font-size-base);
--font-size-h6: 0.75rem;
/* Transition Variables */
--timing: 0.4s;
--easing: ease-in-out;
/* Spacing between grid items */
$gap: 0.5rem;
/* Number of columns in the grid */
$columns: 12;
/* The maximum width of the shell container */
--shell-width: 75rem;
/* The left and right padding of the shell container */
$shell-gap: 1rem;
/* A list of responsive breakpoint names */
--breakpoints: (xs, sm, md, lg, xl);
/* A list of display properties */
--displays: (block, inline, inline-block, flex, inline-flex);
/* A list of text alignment properties */
--alignments: (center: center, right: right, left: left, justify: justify);
}You should place the overwriting variables after the @import statement.
This boilerplate is using the most recent version of the CSS specification.
In order to support more browsers you must use a tool such as PostCSS.
The combined and built version of this boilerplate is using the Postcss-Preset-Env in stage: 0.
This means that you can use the most recent CSS features and be sure that they will work older browsers.
The combined and built version of this boilerplate has been tested and works in all evergreen browsers (Chrome, Firefox, Edge, Opera, Safari, Brave, Vivaldi, iOS Safari, Chrome on Android, Samsung Internet) and IE 10+.
In order to do so in your setup, please refer to the postcss.config.js file.
_colors.css- contains CSS custom properties declared to the:rootnode for all colors_text.css- contains CSS custom properties declared to the:rootnode for all font settings_transitions.css- contains CSS custom properties declared to the:rootnode for transition duration and timing function_variables.css- contains CSS custom properties declared to the:rootnode for all other variables/settings
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_chevron.css- a mixin for a directional arrow iconUsage:
/* prettier-ignore */ @mixin chevron 2rem /* width and height */, 0 0 1px 1px /* border width */, var(--color-action) /* border color */, -5px 0 0 0.5em /* margin */, -135deg /* rotation */;
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_flexbox.css- a set of mixins for flexboxContains several mixins:
/* General purpose flex container */ /* prettier-ignore */ @mixin flex center /* align-items */, flex-end /* justify-content */, wrap /* flex-wrap */, row /* flex-direction */, flex /* display */; /* Flex container with flex-direction set to "row" */ /* prettier-ignore */ @mixin flex-row no-wrap /* wrap */, center /* align-items */, flex-end /* justify-content */; /* Flex container with flex-direction set to "column" */ /* prettier-ignore */ @mixin flex-column no-wrap /* wrap */ center /* align-items */ flex-end /* justify-content */; /* Inline-flex container with flex-direction set to "row" */ /* prettier-ignore */ @mixin inline-flex-row no-wrap /* wrap */, center /* align-items */, flex-end /* justify-content */; /* Inline-flex container with flex-direction set to "column" */ /* prettier-ignore */ @mixin inline-flex-column no-wrap /* wrap */ center /* align-items */ flex-end /* justify-content */; /* Inline-flex container with flex-direction set to "row" */ /* prettier-ignore */ @mixin inline-flex-row no-wrap /* wrap */, center /* align-items */, flex-end /* justify-content */; /* Inline-flex container with flex-direction set to "column" */ /* prettier-ignore */ @mixin inline-flex-column no-wrap /* wrap */ center /* align-items */ flex-end /* justify-content */;
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_media-queries.css- mixins for all supported media queriesCustom media queries:
/* (max-width: 1439px) */ @media (--small-desktop) { } /* (max-width: 1279px) */ @media (--tablet-landscape) { } /* (max-width: 1023px) */ @media (--tablet-portrait) { } /* (max-width: 767px) */ @media (--mobile) { } /* (max-width: 767px) */ @media (--xs) { } /* (min-width: 768px) and (max-width: 1023px) */ @media (--sm) { } /* (min-width: 1024px) and (max-width: 1279px) */ @media (--md) { } /* (min-width: 1280px) and (max-width: 1439px) */ @media (--lg) { } /* (min-width: 1439px) */ @media (--xl) { } /* (min-width: 0) */ @media (--xs-up) { } /* (min-width: 768px) */ @media (--sm-up) { } /* (min-width: 1024px) */ @media (--md-up) { } /* (min-width: 1280px) */ @media (--lg-up) { } /* (min-width: 1439px) */ @media (--xl-up) { } /* (prefers-reduced-motion: reduce) */ @media (--reduced-motion) { } /* hover support */ @media (--hover) { } ;
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_mixins.css- all other mixinsAvailable mixins:
/* absolutely positions an element with known dimensions in the center of their relative parent element */ @mixin centered; /** generates rules for responsive helpers $breakpoint: a breakpoint prefix such as xs, sm, md, lg or xl */ @mixin breakpoint-helpers $breakpoint; /* creates !important declaration for the given $display argument */ @mixin display $value; /** generates rules for grid columns for a given breakpoint $breakpoint: a breakpoint prefix such as xs, sm, md, lg or xl */ @mixin grid $breakpoint;
_form-elements.css- default styles for form elements_reset.css- additional browser reset and normalize (normalize.css is also included)_transitions.css- default transitions for focusable/active elements
_document.css- default styles for thebodyelement_headings.css- default styles for all heading (h1 - h6) tags_links.css- default styles for anchors_texts.css- default styles for text elements
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_grid.css- a grid systemAvailable selectors are:
/* defines a grid container */ .o-grid { } /* defines a grid item */ .o-grid__item { } /** depending on the --breakpoints variables the following selectors will vary. 1 means 1/12 of the available width. 12 means all of the available width. Here are the defaults */ /* From 0 to 767px */ .xs-1 to .xs-12 /* From 768px to 1023px */ .sm-1 to .sm-12 /* From 1024px to 1279px */ .md-1 to .md-12 /* From 1280px to 1439px */ .lg-1 to .lg-12 /* From 1440px above */ .xl-1 to .xl-12;
-
_main.css- styles for themainelementAvailable selectors are:
/* defines the main content. used with <main> element */ .o-main { }
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_shell.css- styles for the site containerAvailable selectors are:
/* defines the site container */ .o-shell { } /* defines the site container as flex container */ .o-shell--flex { } /* makes the site container take the whole browser width */ .o-shell--fluid { }
-
_wrapper.css- styles for the site wrapperAvailable selectors are:
/* defines the parent container of all other elements. usually the only child of the <body> element */ .o-wrapper { }
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_btn.css- default styles for the buttonsAvailable selectors are:
/* default styles for a button */ .c-btn { } /* makes the button fill its parent's width */ .c-btn--block { }
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_list.css- default styles for lists. A list is an element with a classname which starts withc-list
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_align.css- alignment class utilitiesAvailable selectors are:
/* align to the left */ .alignleft { } /* align to the right */ .alignright { } /* clear the alignment */ .alignnone { } /* clear the alignment and center horizontally */ .aligncenter { }
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_clear.scss- utilites to clear after floatsAvailable selectors are:
/* clear both */ .clear { } /* clear right */ .clear-right { } /* clear left */ .clear-left { }
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_fullsize-background.css- helper for background imageAvailable selectors are:
/* makes the element's background image take the whole size of the element using "background-size: cover" */ .fullsize-background { }
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_hidden.css- helper class/attribute for hidden elementsAvailable selectors are:
.hidden, [hidden] { }
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_preferences.css- contains user preferences settings such asreduced-motionorprefers-color-schemepreferences. -
_responsive-utilities.css- helpers for showing/hiding elements on different resolutions. For resolutions reference please check the media queries section.Available selectors are:
.visible-xs-block { } .visible-xs-inline { } .visible-xs-inline-block { } .visible-xs-flex { } .visible-xs-inline-flex { } .visible-sm-block { } .visible-sm-inline { } .visible-sm-inline-block { } .visible-sm-flex { } .visible-sm-inline-flex { } .visible-md-block { } .visible-md-inline { } .visible-md-inline-block { } .visible-md-flex { } .visible-md-inline-flex { } .visible-lg-block { } .visible-lg-inline { } .visible-lg-inline-block { } .visible-lg-flex { } .visible-lg-inline-flex { } .visible-xl-block { } .visible-xl-inline { } .visible-xl-inline-block { } .visible-xl-flex { } .visible-xl-inline-flex { } .hidden-xs { } .hidden-sm { } .hidden-md { } .hidden-lg { } .hidden-xl { }
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_text-align.css- text alignment utilitiesAvailable selectors are:
/* align text to the left */ .text-left { } /* align text to the center */ .text-center { } /* align text to the right */ .text-right { } /* align text to the right */ .text-justify { }
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