How to Change ion-select pop up style

in my app i have my custom style
i need to change background and font color in ion-select to be matched with my app style
i tray [ngStyle] and tray to change from css but none of this solutions works with me
and help please ?

Style applied using style/ngStyle attributes or CSS classes to ion-select and ion-option doesn’t get reflected in the generated output. So the only way to apply the custom CSS to ion-select and ion-options is by using the parent element and some JS(/TS).

Refer my GitHub Repository: