How-To Change Background Colour at Sub-Menue on Scroll-Down behaviour

Dear Kriesi Team,

I am aiming towards a menu structure with several sub-menue items and facing the demand of having a „background and style (font color) change“ bahaviour at my sub-menue was well as it is on the main menue when scrolling down:

Screenshot 1: No Scrolling applied, Quick CSS in General Styling:

.header_color .main_menu .menu ul li a, .header_color .main_menu ul ul {
border-color: rgba(255,255,255,0.25) !important;
border-top-color: transparent !important;
border-bottom-width: 1px !important;
border-bottom-style: solid !important;
z-index: 1;
color: #f8f8f8 !important;
background-color: rgba(255, 255, 255, 0.07) !important;
}

Screenshot 2: When Scrolling is applied, the Problem comes up -> it does not change to colors and styles as the main menue does

Question: How can i change this behaviour, that the sub menue is behaving as the main menue, with transparent background etc.?

Thank you very much for your support and best regards,

Alex