Bulma's CSS doesn't comply with WCAG by default, so applications should to make the following corrections for colour contrast:
Add underlines to links, as there is no clear contrast between links and main text (the colour difference in black vs indigo is not clear enough)
Increase colour contrast in primary / success / info / danger buttons (and various other elements that contrasts white with the primary/success/info/danger colours).
Bulma's CSS doesn't comply with WCAG by default, so applications should to make the following corrections for colour contrast: