Assuming that your Dashboard nodes are up to date, you can pass msg.className to a dashboard widget to change the widget class and so apply custom CSS.
You might get some tips from this post where widgets' appearance is changed by clicking buttons.
Assuming that your Dashboard nodes are up to date, you can pass msg.className to a dashboard widget to change the widget class and so apply custom CSS.
You might get some tips from this post where widgets' appearance is changed by clicking buttons.