Change the font/background color of dropdown created using Select2 in Angular?

I am working on a project. I want to change the background/font color of dropdown list I have created using select2. I want to change the color based on the ID or senlevel (sentivity level).

Below is the code where options have been created,

<select2 [data]="categoriesDropDownList" [value]="selectedCategoryId" [cssImport]="true" [options]="options"
(valueChanged)="onCategoryChange($event)">
</select2>