With node-sass

1. Create a `package.json` file #

In your terminal, create a new folder called mybulma, navigate to it, then type the following command:

npm init

This will launch an interactive setup to create package.json. When prompted for an entry point, enter sass/mystyles.scss.

2. Install the dev dependencies #

You only need 2 packages to customize Bulma: node-sass and bulma itself.

npm install node-sass --save-dev
npm install bulma --save-dev

Your package.json should look like this at this point.

{
  "name": "mybulma",
  "version": "1.0.0",
  "main": "sass/mystyles.scss",
  "license": "MIT",
  "devDependencies": {
    "bulma": "^0.7.1",
    "node-sass": "^4.9.2"
  }
}

3. Create a Sass file #

Create a sass folder in which you add a file called mystyles.scss:

@charset "utf-8";
@import "../node_modules/bulma/bulma.sass";

Make sure to write the correct path to the bulma.sass file.

4. Create an HTML page #

Create an HTML template which uses several Bulma components.

<!DOCTYPE html>
<html lang="en">
  <head>
    <title>My custom Bulma website</title>
    <link rel="stylesheet" href="css/mystyles.css">
  </head>
  <body>
     <h1 class="title">
        Bulma
      </h1>

      <p class="subtitle">
        Modern CSS framework based on <a href="https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Flexible_Box_Layout/Basic_Concepts_of_Flexbox">Flexbox</a>
      </p>

      <div class="field">
        <div class="control">
          <input class="input" type="text" placeholder="Input">
        </div>
      </div>

      <div class="field">
        <p class="control">
          <span class="select">
            <select>
              <option>Select dropdown</option>
            </select>
          </span>
        </p>
      </div>

      <div class="buttons">
        <a class="button is-primary">Primary</a>
        <a class="button is-link">Link</a>
      </div>
  </body>
</html>

Save this file as mypage.html.

Notice the css/mystyles.css path for your stylesheet. This will be the location of the CSS file we will generate with Sass.

Open the page in your browser:

5. Add node scripts to build your CSS #

To build a CSS file from a Sass file, we can use node scripts. In package.json, add the following:

"scripts": {
  "css-build": "node-sass --omit-source-map-url sass/mystyles.scss css/mystyles.css",
  "css-watch": "npm run css-build -- --watch",
  "start": "npm run css-watch"
}

css-build takes sass/mystyles.scss as an input, and outputs css/mystyles.css, while omitting the source map
css-watch builds the CSS and watches for changes
start is simply a shortcut for css-watch

To test it out, go in your terminal and run the following command:

npm run css-build

If set up correctly, you will see the following message:

Rendering Complete, saving .css file...
Wrote CSS to /path/to/mybulma/css/mystyles.css

Reload the page and it should be styled like this:

Bulma default styles — Bulma's default styles

To watch for changes, just launch the following command:

npm start

6. Add your own Bulma styles #

Replace the content of the mystyles.scss file with the following:

    @charset "utf-8";

// Import a Google Font
@import url('https://fonts.googleapis.com/css?family=Nunito:400,700');

// Set your brand colors
$purple: #8A4D76;
$pink: #FA7C91;
$brown: #757763;
$beige-light: #D0D1CD;
$beige-lighter: #EFF0EB;

// Update Bulma's global variables
$family-sans-serif: "Nunito", sans-serif;
$grey-dark: $brown;
$grey-light: $beige-light;
$primary: $purple;
$link: $pink;
$widescreen-enabled: false;
$fullhd-enabled: false;

// Update some of Bulma's component variables
$body-background-color: $beige-lighter;
$control-border-width: 2px;
$input-border-color: transparent;
$input-shadow: none;

// Import only what you need from Bulma
@import "../node_modules/bulma/sass/utilities/_all.sass";
@import "../node_modules/bulma/sass/base/_all.sass";
@import "../node_modules/bulma/sass/elements/button.sass";
@import "../node_modules/bulma/sass/elements/container.sass";
@import "../node_modules/bulma/sass/elements/form.sass";
@import "../node_modules/bulma/sass/elements/title.sass";
@import "../node_modules/bulma/sass/layout/hero.sass";
@import "../node_modules/bulma/sass/layout/section.sass";
  