The buttons on the page are set to be the same distance apart regardless of the page's dimensions. Try modifying the size of your own browser to see.
"
For college-age individuals, reaction times to light stimuli have been published as 190 milliseconds, or 0.19 seconds, and to auditory stimuli as 160 milliseconds, or 0.16 seconds. Human reaction times vary according to the type of stimuli, the method of measurement and the particular study’s results."
You must be registered to see the links
Identifying a red or green outline around each button is relatively easy, unless you're red/green colourblind to be fair.