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<!-- @file Instructions for subtheming using the Less Starterkit. -->

<!-- @defgroup subtheme_less -->

<!-- @ingroup subtheme -->

# Less Starterkit

Below are instructions on how to create a Bootstrap sub-theme using a Less

preprocessor.

- [Prerequisites](#prerequisites)

- [Additional Setup](#setup)

- [Overrides](#overrides)

## Prerequisites

- Read the @link getting_started Getting Started @endlink and @link subtheme Sub-theming @endlink documentation topics.

- You must understand the basic concept of using the [Less] CSS pre-processor.

- You must use a **[local Less compiler](https://www.google.com/search?q=less+compiler)**.

- You must use the [Bootstrap Framework Source Files] ending in the `.less`

  extension, not files ending in `.css`.

## Additional Setup {#setup}

Download and extract the **latest** 3.x.x version of

[Bootstrap Framework Source Files] into your new sub-theme. After it has been

extracted, the folder should read `./subtheme/bootstrap`.

If for whatever reason you have an additional `bootstrap` folder wrapping the

first `bootstrap` folder (e.g. `./subtheme/bootstrap/bootstrap`), remove the

wrapping `bootstrap` folder. You will only ever need to touch these files if

or when you upgrade your version of the [Bootstrap Framework].

{.alert.alert-warning} **WARNING:** Do not modify the files inside of

`./subtheme/bootstrap` directly. Doing so may cause issues when upgrading the

[Bootstrap Framework] in the future.

## Overrides {#overrides}

The `./subtheme/less/variable-overrides.less` file is generally where you will

the majority of your time overriding the variables provided by the [Bootstrap

Framework].

The `./subtheme/less/bootstrap.less` file is nearly an exact copy from the

[Bootstrap Framework Source Files]. The only difference is that it injects the

`variable-overrides.less` file directly after it has imported the [Bootstrap

Framework]'s `variables.less` file. This allows you to easily override variables

without having to constantly keep up with newer or missing variables during an

upgrade.

The `./subtheme/less/overrides.less` file contains various Drupal overrides to

properly integrate with the [Bootstrap Framework]. It may contain a few

enhancements, feel free to edit this file as you see fit.

The `./subtheme/less/style.less` file is the glue that combines the

`bootstrap.less` and `overrides.less` files together. Generally, you will not

need to modify this file unless you need to add or remove files to be imported.

This is the file that you should compile to `./subtheme/css/styles.css` (note

the same file name, using a different extension of course).

#### See also:

- @link templates Templates @endlink

- @link theme_settings Theme Settings @endlink

- @link registry Theme Registry @endlink

[Bootstrap Framework]: http://getbootstrap.com

[Bootstrap Framework Source Files]: https://github.com/twbs/bootstrap/releases

[Less]: http://lesscss.org