Flexbox support is available for a number of Bootstrap's components:
- The entire grid system (mixins and predefined classes), which switch from `float`s to `display: flex;`.
- Input groups, which move from `display: table;` to `display: flex;`.
- The media component moves from `display: table;` and a number of hacky styles to a simple `display: flex;`.
Vendor prefixes are provided in our compiled CSS with Autoprefixer via Grunt.
## Why flexbox?
In a nutshell, flexbix provides simpler and more flexible layout options in CSS. More specifically, it provides:
- Easy vertical alignment of content within a parent element.
- Easy reordering of content across devices and screen resolutions with the help of media queries.
- Easy CSS-only equal height columns for your grid-based layouts.
All these things are possible outside flexbox, but typically require extra hacks and workarounds to do right.
## How it works
If you're familiar with modifying variables in Sass—or any other CSS preprocessor—you'll be right at home to move into flexbox mode.
1. Open the `_variables.scss` file and find the `$enable-flex` variable.
2. Change it from `false` to `true`.
3. Recompile, and done!
Alternatively, if you don't need the source Sass files, you may swap the default Bootstrap compiled CSS with the compiled flexbox variation. [Head to the download page](/getting-started/download) for more information.
## Browser support
Enabling flexbox means **reduced browser and device support:**
- Internet Explorer 9 and below do not support flexbox.
- Internet Explorer 10 has a few known quirks.
Please be extra conscious of your user base when enabling flexbox in your project.
