reveal.js comes with a few themes built in:
Black (default) -
White -
League -
Sky -
Beige -
Simple
Serif -
Night -
Moon -
Solarized
sage: integrate(x^2, x, 0, 5)
125/3
sage: a = matrix([[1, -1], [-1, 1]])
sage: g = NormalFormGame([a])
sage: g.obtain_nash()
[[(1/2, 1/2), (1/2, 1/2)]]