Sense Theme - Change Single Menu navigation button to Red

[Littlestars2020]

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

[shreyhweb]

@Littlestars2020 

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