Yes you still need to add your custom CSS code otherwise the plugin won’t know what blacklayer is supposed to be styled like.
So you can add blacklayer in the featured image field, and then use that classname in your custom CSS within the Customizer, like so:
.blacklayer {
/* styles here */
}
The class blacklayer will be applied to your Featured Images.
Hope this helps.
I’ve just found and used this plugin – running WP 4.7.2 – and everything is working just fine (so far).
To use this plugin you just reference the CSS class you have created in the newly added fields in the media library. What I did was as follows:
1.) installed plugin
2.) created css class in my style.css file
3.) applied css class to featured image via the media field that was added to the images in the wordpress media library
Step 3 is as simple as just copying the name of the css class you already created in your css file into the field. So if in your css file you created ‘.custom-class’, you would just add ‘custom-class’ into the field.
Hopefully this helps.
