#### Install bootstrap
`npm install react-bootstrap bootstrap`

#### Install Sass
`npm install node-sass gatsby-plugin-sass`

#### Set up Bootstrap scss
 - Download source files from getbootstrap.com and copy the `scss` directory to `src/scss/bootstrap`
  - Configure gatsby-plugin-sass, specifying the bootstrap scss directory created in porevious step:
 ```
 plugins: [
   {
    resolve: `gatsby-plugin-sass`,
    options: {
      includePaths: ["src/scss/bootstrap"],
    },
  },
]
```
 - create a src/components/layouts.scss file (or use another top level component) with the following sass:
 ```
/* import the necessary Bootstrap files */
@import "functions";
@import "variables";

/* put your custom stuff here */

/* finally, import Bootstrap */
@import "bootstrap"
```