Bootstrap 4 comes with opt-in flexbox support. You can enable flexbox support by switching a Boolean variable and recompiling your CSS. In this recipe you will learn how to do this.
As already mentioned, enabling flexbox support is as simple as switching a Boolean variable and recompiling your CSS. So, first read the Downloading and installing Bootstrap and the Customizing Bootstrap using variables recipes of this chapter. In this recipe, you also will make use of the page inspector of your browser.
There are two main ways to open the Inspector: