How to make all boxes the same width in a product catalog using flex-box?

Question

Flexbox

I prescribe to the elements the property flex: 1 calc (33.33% - 20px); if there are only 5 elements, then 3 elements have a width of 33% and the other two have a width of 50%. Is it possible for all blocks to have the same width?
Answer: You need to set the property flex-basis: auto; width: 33.33%