How can I have two fixed width columns with one flexible column in the center?

Instead of using width (which is a suggestion when using flexbox), you could use flex: 0 0 230px; which means:

  • 0 = don’t grow (shorthand for flex-grow)
  • 0 = don’t shrink (shorthand for flex-shrink)
  • 230px = start at 230px (shorthand for flex-basis)

which means: always be 230px.

See fiddle, thanks @TylerH

Oh, and you don’t need the justify-content and align-items here.

img {
    max-width: 100%;
}
#container {
    display: flex;
    x-justify-content: space-around;
    x-align-items: stretch;
    max-width: 1200px;
}
.column.left {
    width: 230px;
    flex: 0 0 230px;
}
.column.right {
    width: 230px;
    flex: 0 0 230px;
    border-left: 1px solid #eee;
}
.column.center {
    border-left: 1px solid #eee;
}

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