The way that Inger & Twinstream are suggesting will work, & the styling for the menu comes from within SDv3 so thats more control over styling
The one I have needs the custom CSS file editing in order to change the colours/font etc so it depends on how you are with CSS.
Its only a couple of changes needed for the colours & the font which can be done in any text editor or html editor
then reloading the css file back into SDv3
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Learning by doing. Responsive Site Designer Tutorials
Learning by doing. Responsive Site Designer Tutorials