WebComboBox: How to change the color of the menu item

In Web 2.0 I can change the background color of the text field and the menu with JavaScript. However, I am not able to change the text color of the menu items (I need a dark menu background, the menuitems should have a white text color). The ContextualMenu example shows that it really has to be simple, but there is no property TextColor for the MenuItems of the ComboBox. There are some examples for JavaScript and CSS on stackoverflow, unfortunately I didn’t have any success with them. Anyone an idea?

My Code in the Shown-Event after adding the rows in the Opening:

JSString = “document.getElementById(’”+me.ControlID+"_input’)"
me.ExecuteJavaScript JSString +".style.backgroundColor = ‘rgba(28, 29, 28, 1)’;"

JSString = “document.getElementById(’”+me.ControlID+"_input’)"
me.ExecuteJavaScript JSString +".style.borderColor = ‘rgba(100,100,100)’;"

JSString = “document.getElementById(’”+me.ControlID+"_input’)"
me.ExecuteJavaScript JSString +".style.textColor = ‘rgba(255, 255, 255)’;"

JSString = “document.getElementById(’”+me.ControlID+"_menu’)"
me.ExecuteJavaScript JSString +".style.backgroundColor = ‘rgba(22, 23, 22, 1)’;"

JSString = “document.getElementById(’”+me.ControlID+"_menu’)"
me.ExecuteJavaScript JSString +".style.textColor = ‘rgba(0, 0, 0)’;"

JSString = “document.getElementById(’”+me.ControlID+"_button’)"
me.ExecuteJavaScript JSString +".style.backgroundColor = ‘rgba(10,10,10)’;"

JSString = “document.getElementById(’”+me.ControlID+"_button’)"
me.ExecuteJavaScript JSString +".style.borderColor = ‘rgba(100,100,100)’;"

A change to the overall look of a control should be done with a bootstrap theme, shouldn’t it?

The following code in the HTML header works as a workaround for me:

> <style>
> body {
> color: rgb(255, 255, 0);
> }
> </style>

Whatever the reason, changing all other color properties, including .dropdownmenu-item, has no effect.