How to change the background colour of menu panel?

Can I change the colour background of the menu panel?

On the left "Design Setting" box, select "Book-->Background config-->Background Color".

If you want to the background is gradient color, let me show you details:

1. Set two edges color;
2. Set the angle gradient color;
3. Click button "Apply Change".

PS: You can check the preview effects, and then modify it to come to the best;

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