Can add hover/focus background-color settings option for the dismiss button

[FastChen]

Feature Request

Is your feature request related to a problem? Please describe.

button background-color and text color have setting option. can add :hover/:focus background-color settings option?

Describe the solution you'd like

A detailed description of your proposed solution. Include:

• there is no need to customize CSS
• there can input var(--variable) control :hover/:focus background-color

Describe alternatives you've considered

use custom Less/CSS

.cc-btn:hover .cc-btn:focus {
    background-color: var(--secondary-color);
}