Hi @alekmisjen,
First, you need to find the specific page ID number on the page which you want to apply the custom header image.
To discover the page id, please follow the steps below:
1. Navigate in your browser to the page you want to work with.
2. Right-click on that page (anywhere) and select “Inspect Element“.
3. Search inside the site’s markup for the body tag. It should be one of the first
element in the source.
You’ll see it has many classes. Look for the class that starts with “page-id-…”. That’s the class you should use.
You can check THIS video guide.
And now add the below CSS:
.page-id-53 .header-image-wrap img {
content: url('https://res.cloudinary.com/fleurop/cmsimages2/content/newsletter/alles-ueber-blumen/valentinstag-rosenblaetter-header.jpg');
}
Help link?https://docs.themegrill.com/knowledgebase/where-do-i-add-my-custom-css/
P.S Header image must be enabled.
Thanks and Regards,
Milan.