Equal width using flex and border-box

Question

I am using box-sizing: border-box; with varying border thicknesses within a flexbox. I want the elements within the flexbox to have equal widths, b

Answer 1

The box-sizing: border-box is used to change the default CSS box model used to calculate width and height of the elements.

So would be like this:

• total width = border + padding + content width

  and

• total height = border + padding + content height

But that doesn't happen in flex-grow, but in flex-basis

Here is a good tutorial about flexbox

---

So you can use flex:0 20% instead of flex:1,

.container {
  display: flex;
  flex-direction: row;
  align-items: center;
  width: 100px;
}

.container .block {
  height: 28px;
  flex: 0 20%;
  border: 1px solid black;
  box-sizing: border-box;
}

.container .block.selected {
  border: 3px solid blue;
}

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Note: if you have more elements than 5, then you can use calc() like this flex: 0 calc(100%/8) where 8 is the # of elements you will have

Snippet with more elements

.container {
  display: flex;
  flex-direction: row;
  align-items: center;
  width: 100px;
}

.container .block {
  height: 28px;
  flex: 0 calc(100%/8);
  border: 1px solid black;
  box-sizing: border-box;
}

.container .block.selected {
  border: 3px solid blue;
}

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