Picture size in Education Pro

Hy, I am using your theme: Clean Education Pro and have two questions: Is there any opinion, to change the settings for Square Pictures? Square(Used in Archive image left/right) Width: 240px Height: 240px My second quetions is, whether it is possible to change the time to slide the images at the courses-slider (Transition Length) Pherhaps it could be done with the CSS ??