How would you hide the application ribbon?

To hide the application ribbon in Microsoft Office applications, you can simply double-click on any of the tabs on the ribbon. This will collapse the ribbon and only show the tab names. To show the ribbon again, you can double-click on any of the tabs or press Ctrl + F1.

Here is the CSS to hide the application ribbon:

```
.ms-vh2 {
display: none !important;
}
```