3 blocks in one line?

Question

css

There is a rubber block. I want to put 3 more blocks in it, all in 1 line. The first and second of these both have a 2px stroke on the right, and here's how to make each stroke 1/3 of the parent's width.

Answer 1

.block {
  box-sizing: border-box;
  width: 33.333%
}