Can Flexbox Fill Remaining Vertical Space Like it Does Horizontal Space?

Implementing Vertical Flexbox Space Filling

Problem:

Within a flexbox row, it's possible to designate a specific element to fill the available horizontal space using the flex property. However, achieving the same behavior vertically has proven challenging, as the element designated to fill the space lacks height.

Question:

Is there a way to utilize flexbox to have a content element fill the remaining vertical space within a flexbox column, similar to how it can be done in a flexbox row?

Answer:

Yes, by employing the following two modifications:

1. Set flex-direction: column for the flex container.
2. Assign flex: 1 to the element that should occupy the remaining vertical space.

By applying these techniques, you can ensure that the specified element extends to the bottom of the flex container, effectively filling the available vertical space.

Example:

Consider the following code snippet, which demonstrates how this approach can be implemented in practice:

<div class="row">
  <div>some content</div>
  <div class="flex">This fills the available space</div>
  <div>another content</div>
</div>

body {
  margin: 0;
}
*{
  box-sizing: border-box;
}
.row {
  display: flex;
  flex-direction: column;
  height: 100vh;
}
.flex {
  flex: 1;
}
.row, .row > * {
  border: 1px solid;
}

By setting flex-direction: column for the parent container and flex: 1 for the desired element, we effectively create a flexbox layout that fills the vertical space as intended.

This approach eliminates the need for absolute positioning, providing a more elegant and flexible solution for filling vertical space in flexbox layouts.

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