Sense Theme - Change Single Menu navigation button to Red

Store Design
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1

Have tried a lot of different codes that have been mentioned in forums but cannot seem to get it right. I am trying to make the font on my winter sale button in the top menu bar red.

Here is the link

littlestarschildrenswear.co.uk/collections/new-in

2

@Littlestars2020

can you please share a screenshot ? for the understand where to want red button.