Swiss ski map style (GL) updated for Mapbox Streets v7 for Mapbox Studio
From your Mapbox Studio Styles page, click New Style button then select Upload a style tab. Select this .json file and click Create. Next, upload each .svg patterns and icons from the icons and fonts folder.
Use the newly created map style's style URL to add to your projects. Read more on how to Create and manage map styles in Mapbox /help page.