How to create a bottom bar

Check this demo, it has a bottom bar, how to create one?

1. Go to BO > ELement Flow > Content Builder > Hooks.
2. Add a new record, and select the displayBeforeBodyClosingTag hook., this is important because whatever is added to the displayBeforeBodyClosingTag hook is a direct child of the body tag, which makes sure that the added content can be placed at the very bottom of the page.
3. Add a container to the canvas, and set its Position to Fixed, set bottom, left, and right to 0, the very last step is to set a high z-index to make sure the bottom is on top of other elements.