This guide shows you howto change the color of the wingpanel. If you wish to have different color than shown in this guide I suggest installing Gimp from the App Center to easily get the RBG numbers.
Open the terminal and copy/paste;
nano ~/.config/gtk-3.0/gtk.css
Insert the following;
/********************* * wingpanel support * ********************/ .panel { background-color: rgba(255,255,255,0.5); transition: all 1s ease-in-out; } .panel.maximized { background-color: rgba(255,255,255,0.5); }
This will make your wingpanel white transparent. The 3 first number in RGBA is the color numbers. Use Gimp to find the color you want. If you want a black wingpanel, change all 255 with 0. The last number is how transparent the panel is going to be. It range from 0.0 (complete transparent) to 1.0 (Solid).
Save: [ctrl]+[o]
Exit: [ctrl]+[x]
When done type;
killall wingpanel
Enjoy! ^_^
Tested on: elementary OS 5.1.4 – 5.1.6
Source: https://www.reddit.com/r/elementaryos/comments/cru778/how_to_make_the_wingpanel_always_transparent/