How do I use CSS to modify Panel widgets' style like fontsize and color?

Panel
3

A more complex example:

image
image666×784 123 KB

  1. Ignore div
  2. Prefix with periods if there’s a div prefix
  3. Add spaces in between
.bk.card .bk.card-header .bk.card-header-row .bk.card-title .bk.bk-clearfix {
    font-size: 2em;
}