[BUG] all panels turn opaque when changing button's size

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Describe the bug
When specifying a button's height/width, the button is resized properly but all panels turn opaque even when I've set a transparent background, even when no buttons are currently visible

To Reproduce
Steps to reproduce the behavior:

1. Edit the default CSS
2. Replace background: #101010; with background: transparent; under #panel-top and #panel-bottom (to demonstrate)
3. Add width: 20px; under button {}
4. Restart nwg-panel

Expected behavior
The buttons are resized, but the bar is still transparent

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• Arch (btw)
• scroll version 1.12.3 (I'm using a Sway fork)
• nwg-panel version 0.10.13

Additional context
I'm using the default Orchis Dark theme and Papirus-Dark icons, but the issue also occurs with Adwaita theme/icons (default theme)

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and yes, my compositor does support transparency

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is there another way to force bar size or shrink the buttons?