DervaFX currently ships with a single built-in stylesheet: /com/princeofcookies/dervafx/dervafx-dark.css

Apply the Current Theme

Scene scene = new Scene(host, 900, 600);
DervaFX.applyTheme(scene);

Select the Built-In Theme

DervaFX.setTheme(DervaTheme.dark());

Use a Custom Theme Resource

DervaTheme custom = DervaTheme.of("custom")
    .stylesheetResource("/com/example/my-theme.css");

DervaFX.setTheme(custom);

• Themes are scene-level stylesheet attachments.
• DervaThemeManager tracks scenes and reapplies the current stylesheet when the theme changes.
• If a stylesheet resource cannot be found, DervaFX throws an IllegalStateException.