Show `n` columns side-by-side with CSS

See here for the original answer.

I fixed this here. The problem was the flex was overriding the default width.

This is what the CSS is now:

.col-md-4 {
  flex: none;
  max-width: 33.3333333333%;
  width: 20%;
}

It successfully sets the width of the columns to 20% instead of 33.3%.

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