Basic HTML structure
The {NUMBER} must be chosen from the available ones. Example:
This will apply the "effect201" to the image.
HTML structure for effects with Overlays (Overley effects)
As you can see, you just need to add the "overlay" tag inside the "div".
The effects can be always active or can triggered on hover. To do that you need to add the "effect-hover" class.
Or remove the effect on hover by adding the class "effect-hover-reverse".