The theme property (string) specifies the CSS theme name used by the menu.
If it is not set, the built-in "menu_default" theme is used.
DayPilot.Menu.themenullWhen using a custom CSS theme, define the CSS classes with the selected theme prefix.
const menu = new DayPilot.Menu({
theme: "my_theme",
items: [
{ text: "Open" }
],
// ...
});