it a solid light grey. This disappeared from OS X Yosemite, which moved transparency settings to Accessibility > Display, where they remain in El Capitan and macOS. This is a useful option for increasing legibility.
Change and manage your screen savers Click Screen Saver to access the screen savers pane. To the left is a selection of built-in screen savers; select one to choose it as the currently active screen saver (or choose Random to have one be selected at random whenever the screen saver is activated), and use the Start after menu to determine how long your Mac remains idle before the screen saver starts. Optionally, a clock can be overlaid on the screen saver, by checking Show with clock. Depending on the screen saver chosen, you may get options. For the various photographybased screen savers, you’ll see a Source menu, enabling you to define a source folder of photos to use. On choosing a new source, the screen saver preview will update accordingly. Checking Shuffle slide order randomises the presentation from the selection of images. For other screen savers, you’ll get a Screen Saver Options button that when clicked provides in-context settings for that particular screen saver. For example, Apple’s own Flurry enables you to adjust how many streams of colour appear on the screen, how thick they are, and how fast they move. To the bottom-right of the pane is a Hot Corners… button. The options are shared with Mission Control and provide the means to trigger 40 MACWORLD • JANUARY 2017 MWJAN17.indd 40