Published: 8.5.2019 | Last update: 13.5.2019 ... Bootstrap is the most popular HTML and CSS framework for developing responsive websites. By default, scrolling kicks in at 75vh (or 75% of the viewport height), but you can override that with the local CSS custom property --bs-navbar-height or custom styles. . To boost your coding skills, have a look at my collection of Bootstrap tutorials. The vertical menu and their detail content display simultaneously. The following syntax is the vertical menu bar.