Customizing it with less is really pretty straightforward. You can also generate custom css from the website. Just click the customize tab in the topbar. You

Customizing it with less is really pretty straightforward. You can also generate custom css from the website. Just click the customize tab in the topbar. You can bump up @baseFontSize. 16px works very well. You might also want to increase the @baseLineHeight a bit as well.