A 10-by-10 square grid.
The small squares on the left half are coloured yellow, those on the right are coloured red.
When you click on the picture it changes.
25 small squares in the bottom left quarter are coloured yellow, the remaining 75 in the other three quarters are coloured red.
The caption says:
25% = 25/100 = ¼.
75% = 75/100 = ¾.