I need to edit bokeh CSS classes for some custom widgets in my apps. I am relatively new to CSS. Browsing through bokeh-widgets.css it is not readily apparent which CSS classes match up with which bokeh widgets. For instance, which CSS class specifies the properties (font, etc.) of Select from bokeh.models.widgets? Up to now I have been modifying CSS classes by trial and error but this is getting tedious. So is there a global decoder or reference for how the widgets and CSS classes correspond to one another?