Still doesn't work ;( Could you please give me a complete code for the banner to look like this:  Maybe my code has a mistake preventing it from working correctly...

Add it to the header background code or the general background code?

Correct, yes

Thank you very much, did you find anything?

Still looks like this: 

What could be the reason that it doesn't look like that on mine than? 

On my page it still doesn't look blurry, only transparent Could you maybe share a screenshot, if it looks any different on your end?

Url: https://ntjdp1-gz.myshopify.com/

I am trying to get my baner to look like this, where the Header is transparent but also blurrs out the background:          I have tried multiple answers that were already posted on here, but I just get it to this point and I can't figure out why my ...