We use Bootstrap v4.3.1 to make jekyll-vfolio responsive and mobile-first. We mentioned earlier that we use both Markdown and HTML syntax along the project. The code also involves the use of Bootstrap CSS and JS libraries.
To learn how bootstrap works and how you may alter the code of theme to suit your requirements follow the guides below:
- Bootstrap v4.3.X guide - https://getbootstrap.com/docs/4.3/getting-started/introduction/
- Bootstrap 4 Tutorial by w3schools - https://www.w3schools.com/bootstrap4/