Lock in category bar in prestashop

Avg Bid (GBP)
Project Budget (GBP)
£20 - £250

Project Description:
Website www.modern-living.co. I need the top category bar to be locked in so that it doesn't scroll and is always on show at top of page and all beneath it scrolls.

Skills required:
About the employer:
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£ 250
in 10 days
£ 250
in 10 days
£ 30
in 0 days
£ 150
in 3 days