sold sign - css 7.1

Hello! 

I would like to edit the sold sign so there is a transparency over the whole item. The current css that I have been editing doesn't create a transparency over the whole image (I have attached an image of what I mean). I would be so grateful if someone could help me with this query

Thank you so much 

https://clavichord-fife-6enj.squarespace.com/config/ 

password: amberamber

@tuanphan Hi Tuanphan, I was wondering whether you could point me in the right direction of how to fix?

thank you!

It looks like you solved this?

--

I see shop page, browser tab name shows "The 2^nd