Go to Site Administration -> Plugins -> Activities modules -> Lesson and change the defaults values for the Slideshow width, Slideshow height and Slideshow background color settings (it may be easier to enter "strange" values here so that their effect is more visible later!). Verify that a coulourpicker form element is available for background color and is working. In a course create a lesson choosing Slidehow = Yes in the Appearance setting section. verify that the default values chosen in Administration are correctly displayed for the slideshow width, Slideshow height and Slideshow background color settings in this form but don't change them. Add some contents pages to the lesson, it would be good to also add some question pages (question pages currently don't use the slideshow display), some branch pages, ... Verify that when previewing the lesson as a teacher you see the correct appearance. With a fixed width, height, and custom background color. A CSS based scroll bar will be displayed if the width or height of the slide is exceeded by the content of a page. Questions will 'break out' of the slide show mode, only content (branch tables) pages will be shown in a slide by default. Buttons labelled with the default for "Next" and "Previous" will be shown at the far right and left of the slide if that option is chosen on the page. Other buttons will be centered below the slide. Edit the lesson settings and change the value for the Slideshow width, Slideshow height and Slideshow background color settings (verify that a coulourpicker is used for the background color and working). Save. Verify that the lesson's appearance is correctly changed when previewing the lesson or attempting it as a student.