Bulma CSS & vanillaJS/jQuery should be enough for most cases. Fast enough, instant feedback/updates and lightweight. You'll be saving yourself a lot of time by

Bulma CSS & vanillaJS/jQuery should be enough for most cases. Fast enough, instant feedback/updates and lightweight. You'll be saving yourself a lot of time by not googling version compatibility issues or some obscure package bug of the front-end framework itself. You only need full blown frameworks when you create an application which multiple teams would be working independently on and preferably using CI-CD as the means of deployment, this is absolutely not needed when you're trying to validate a solution or build a one-off project.