Why aren't the boxes in line

Question

https://code.sololearn.com/WAz6l86lu3mq/?ref=app

Answer 1

use
float
in both b1 and b2 css

Answer 2

if you want ro create 3x3 grid use different id.
make different boxes so they will not collide

Answer 3

But I have to create a 3x3 matrix of such boxes and the float attribute creates problems