How to change the Before and After Plugin look & feel?
The Slider divider is the element that shows over the images and allows the user to slide and reveal the images.
Note: changing the divider colors is a premium feature.
Changing the divider color and thickness
Enter the Look & Feel tab on the Editor, and under the Advanced tab, enter the Slider Divider Customize options.
Here you can customize the divider color and change the thickness.