Create and use FAST_FADE_DURATION and SLOW_FADE_DURATION constants
Modify box-shadow of panel-inner-container
Change horizontal alignment of panel-table to centred
Make panel-outer-container fill the window
Remove obsolete functionality from configureCanvasMousemove()

Now that panel-outer-container fills the entire window,
it's impossible for a mousemove event to occur on the canvas
when the control panel is displayed