Add slider to header and hide on scroll + add in stock on collections page in green and out of stock in red on product card (check photos)

I need to have 4 boxes added to the header that needs to be hidden on scroll and they need to link to other pages (check photos)

Now the 4 boxes are on the page and not on the header and they are too big it needs to be smaller. for example check ledpaneelgroothandel.nl

On product card there needs to come 'Op Voorraad' in green when product is in stock and 'Niet op voorraad' in red when product is out of stock