how to use bulma in gatsby
yarn add bulma sass gatsby-plugin-sass
Then, add the gatsby-plugin-sass in to gatsby-config.js.
plugins: [`gatsby-plugin-sass`],
create a custom scss file with the following configs
@charset "utf-8";
@import "~bulma/bulma.sass";
Now lastly import your custom scss file into your index.js file or whichever file you want