How to set a transparent "arc menu" and width of wifi/logout "applet"


a) I would like to set a specific opacity for the arc menu. How do I have to do it? What to edit and where?

b) In the upper right corner we have a combined “applet” for battery, loudspeaker, bluetooth and wifi, which collapses, if I hover over it. I would like to change width and make it wider. How do I do this?

sudo nano /usr/share/themes/Matcha-azul/gnome-shell/gnome-shell.css 

I have changed in this file the font-size of the arc menu, but I dont know, if I need to make my two other changes from above.
Thank you for any help!

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