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The mind must be given relaxation; it will arise better and keener after resting. As rich fields must not be forced-for their productiveness, the have no rest, will quickly exhaust them constantlabor will break the vigor of the mind, but if it is released and relaxed a little while, it will recover its powers
Seneca

:fullscreen

The :fullscreen CSS pseudo-class matches every element which is currently in fullscreen mode. If multiple elements have been put into fullscreen mode, this selects them all.
:fullscreen css reference