Menu Customize

Hey Team, Happy new year to ya all. Just some short questions about CSS Coding for further Menu Customization. See my attached image and the numbers 1) to 3). 1.1) How can I change the Background to another color. 1.2) How can I change the background color to 50% opacity. Remark: I only want to make these changes to the dropdown-menu, not the main-menu itself. 2) How can I change the Color and size of the Border around the Dropdown-box 2.2) How can i change the box width -> Noch Fragen 3) How can I apply a hover effect regarding the text color (e.g. if i hover over the menu-item "Grafikdesign" the text shall be red) 4) How can I reduce the distance between the Dropdown-Menu and the Main-Menu. Thanks for helping out. BR Dirk