Flexbox parent div experiencing overflow due to horizontal margins protruding beyond the boundaries

Experiencing unexpected margin behavior with flex and seeking help for clarification.

Here is a simple HTML structure I am using:

<div className="dashboard">
    <div className="dashboard__inner-container">Inner Container</div>
</div>

The SCSS file looks like this:

.dashboard {
  text-align: center;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  flex: 1 1 auto;
  background-color: #f4f6f8;
}

.dashboard__inner-container {
  display: flex;
  flex-direction: column;
  background-color: #ffffff;
  flex: 1 1 auto;
  width: 100%;
  margin: 100px 50px;
}

Expectations are set for the inner container to fill up the parent container while maintaining specific margins. However, the horizontal margin appears to extend beyond the parent div.

Uncertain if this issue is related to flexbox.

For further investigation, see an isolated CodePen https://codepen.io/MaxMillington2/pen/EQWZoj

Answer №1

When you apply align-items: center to a container with flex-direction: column, the item within it will shrink to fit its content width, as opposed to the default behavior of stretch which makes it expand to fill the parent's width.

In addition, if you set width: 100% on the inner element, it will override the default stretching behavior and cause the item to take up 100% of the parent's width including any margins.

To achieve the desired result, remove align-items: center from the outer container and remove width: 100% from the inner one.

See below for the code snippet:

html {
  height: 100%;
  overflow: auto;
}

.outer {
  display: flex;
  justify-content: center;
  flex-direction: column;
  background-color: #f4f6f8;
  height: 100%;
}

.inner {
  display: flex;
  flex-direction: column;
  background-color: #ffffff;
  flex: 1 1 auto;
  text-align: center;
  margin: 100px 80px;
}
<div class='outer'>
  outer
  <div class='inner'>
    inner
  </div>
</div>

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