o_O

Lets Do Some Physics.

Gravity is an important in animation. When you do animation, you must learn some physics. Free Fall is important fact.
Free fall is going like 5, 15, 25, 35... If you divide this number to 5, you will achieve odd numbers (1,3,5,7...).
FREE FALL BEGINS.
1) 1*5 Px
2) 1*5 + 3*5 Px = 4*5 Px
3) 1*5 + 3*5 + 5*5 Px = 9 Px
4) 1*5 + 3*5 + 5*5 + 7*5 Px = 16 Px
If you notice it is squared by 1,2,3,4...
Then, (n^2)*5 = x px
But, how can I use this in CSS?
IT IS `calc()`!