Dark theme for Modal

[katydecorah]

The color of the close icon is always blue, but sometimes I wish it could be white. Example:

A couple ideas come to mind:

• Add a dark theme (example: theme='dark' which would set the close icon to color-white and the background of the modal to bg-dark-gray. But you could still customize by turning off the padding like in the example above.
• Add option to change color of close icon - solve the root problem.

Opinions?