How to Align an Element to the Bottom of Its Container Using Flexbox?

Align Element to Bottom with Flexbox

Aligning an element to the bottom of its container can be achieved using Flexbox. In this scenario, where there's a div with various child elements and a desire to keep a .button element fixed at the bottom, Flexbox offers a solution.

Flexbox distributes free space to "auto margins" before performing alignment using justify-content and align-self. This means we can use auto margins to push the .button element to the bottom without removing it from the flow.

Here's how it's done:

Using Margin-Bottom: Auto

p {
  margin-bottom: auto; /* Push following elements to the bottom */
}

This rule pushes the following elements, including the .button element, to the bottom of the container.

Using Margin-Top: Auto

a {
  margin-top: auto; /* Push it and following elements to the bottom */
}

Alternatively, this rule pushes the .button element and any subsequent elements to the bottom.

To demonstrate the effect, consider the following HTML and CSS:

.content {
  height: 200px;
  border: 1px solid;
  display: flex;
  flex-direction: column;
}

h1, h2 {
  margin: 0;
}

a {
  margin-top: auto;
}

<div class="content">
  <h1>heading 1</h1>
  <h2>heading 2</h2>
  <p>Some text more or less</p>
  <a href="/" class="button">Click me</a>
</div>

This will create a container with a fixed height, where the .button element will remain at the bottom regardless of the amount of text in the paragraph.

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