Fixed width child is shrinking in flexbox

Question

I'm using display:flex for the first time.

You find a codepen here: https://codepen.io/chrispillen/pen/GEYpRg

.node:not(.branch) {
  width: auto;
  height: 100px;
  background: red;
  margin-bottom: 1px;
}

.node.branch,
.node.branch .body {
  width: auto;
  overflow: hidden;
}

.node.branch .leaf {
  width: 100%;
  height: 100px;
  background: blue;
}

.node.branch .body {
  width: 100%;
  display: flex;
  align-items: stretch;
}

.node.branch .body .tribe {
  width: 100px;
  background: blue;
  margin-right: 1px;
}

.node.branch .body .subnodes {
  padding-top: 1px;
  width: 100%;
  overflow: hidden;
}

<div class="node"></div>
<div class="node branch">
  <div class="leaf"></div>
  <div class="body">
    <div class="tribe">TRIBE</div>
    <div class="subnodes">
      <div class="node"></div>
      <div class="node"></div>
    </div>
  </div>
  <div class="leaf"></div>
</div>

The "tribe" element doesn't remain with a width of 100px.

Everything else works as supposed. Can I force it somehow? And by the way: is flex the true reason for this behavior?

See this section ***The `flex-shrink` factor*** in [**this answer**](https://stackoverflow.com/q/34352140/3597276). — Michael Benjamin, Jul 08 '17 at 14:48

Vadim Ovchinnikov · Accepted Answer · 2017-07-08T16:14:05.177

Flexbox items have flex-shrink parameter with default of 1. This means that in case your flexbox container don't have enough space its items will shrink.

To disable this behaviour for flexbox item set flex-shrink: 0.

Demo:

.node:not(.branch) {
  width: auto;
  height: 100px;
  background: red;
  margin-bottom: 1px;
}

.node.branch,
.node.branch .body {
  width: auto;
  overflow: hidden;
}

.node.branch .leaf {
  width: 100%;
  height: 100px;
  background: blue;
}

.node.branch .body {
  width: 100%;
  display: flex;
  align-items: stretch;
}

.node.branch .body .tribe {
  width: 100px;
  flex-shrink: 0; /* new */
  background: blue;
  margin-right: 1px;
}

.node.branch .body .subnodes {
  padding-top: 1px;
  width: 100%;
  overflow: hidden;
}

<div class="node"></div>

<div class="node branch">
  <div class="leaf"></div>

  <div class="body">
    <div class="tribe">TRIBE</div>

    <div class="subnodes">
      <div class="node"></div>
      <div class="node"></div>
    </div>
  </div>
  
  <div class="leaf"></div>
</div>

Fixed width child is shrinking in flexbox

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