How to allow Blox widgets to take the default dashboard style

[irismaessen]

I'm starting out trying to create Blox widgets. Most of these are not intended extend dashboard functionality to show sparklines and to put filters on the dashboard rather than to the side of it. So I'd like these widgets to fit in  with the styling of the rest of the dashboard.

One thing I'm wondering about is this: How do I let the default dashboard style/stylesheet apply to the Blox widget? I see that I can change some aspects of the styling in the Configuration tab and I can attach a full stylesheet to the widget itself.... but it seems I have to specify the style in the Blox widget itself. Is there no way to default to whatever existing stylesheet there is?