Hope you are Doing well !!!
I checked your issue and here is the solution below
Please Follow the steps
1. Open your site administrator
2. Then Go to the Extension > template
3. Then open your Default template setting
4. Then go to the color settings and your can manage your header and menu color from there
I have also share a screenshot and transparent color code with you Hope it will help you well.
Transparent color code - rgba(255, 255, 255, 0)
Screenshot - www.screencast.com/t/QMHJGU6cB
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How to change the menu background color
3 months 2 weeks ago #15952
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