Today we rarely see a e-commerce website without a slider on it , it always was my first priority to create an eye candy slider. i rarely see a slider with a navigation button on it i don't know why developers dont try add it , in my opponion it makes slider have more ease of access for end user if there was a navigation button with quate on it. in my last project i tried to add and customize sliders with this navigations as u see in the picture.
