I'm looking to improve the look of buttons on CiviCRM public forms. I am using a bootstrap sub-theme. Are the button classes documented anywhere? Any suggestions for addressing this?
Using Drupal 7 & CiviCRM 5.x
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If you're using Drupal + CiviCRM you should check out the "Shoreditch" theme for CiviCRM which changes the CiviCRM UI to use bootstrap based styling.
Note: Shoreditch is in Alpha state and undergoing active development, we are using this in production and aside from a few minor issues it's working very well.
If you're not using Drupal you would want to look at overriding the CSS in your CMS/site theme. You can get the button classes etc using the "Web Inspector" in any major web browser - these are not directly documented at present.