Adding background image to an existing section

[tim_tairli]

1. Upload you image to the Content-> Files area of your store. Make sure it’s not huge – for background image something like 1024px-wide should be ok.
2. Get the URL of this image – Use “Copy link” button on the far right.
3. Go to the settings of the section in question in “Edit theme”
4. Add code like this into “Custom CSS” setting where ... is the URL you’ve just copied

{
  background-image: url(...);
  background-size: cover;
}

this code will only work in “Custom CSS” setting

Like this: