Bootstrap’s font sizes are calculated off of the body font size by using rem values. If you change the body font size all styles will be increased/decreased automatically. Rem stands for “root em” because it calculates the size based on the size of the root of the document or body tag.
Bootstrap allows you to group a series of buttons in a button group. Use a <div> element with class .btn-group to create a button group.
Vertical Button Groups:
Use the class .btn-group-vertical to create a vertical button group.
Justified Button Groups:
To span, the entire width of the screen, use the class .btn-group-justified.
Nesting Button Groups & Dropdown Menus:
Nest button groups to create dropdown menus.
Split Button Dropdowns:
Split button dropdowns use the same general style as the dropdown button but add a primary action along with the dropdown. If you deleted the span parts then, the dropdown menu shows you half because you create a dropdown menu but not to call.
What is Bootstrap?
It is a free font-end framework (HTML and CSS) for faster and easier web development.
Bootstrap is famous for being development with components that have the ability to follow the property of responsive designs.
It gives you the ability to easily create responsive designs.
Advantage and Disadvantage
Works in all modern browsers(IE9+,chrome,safari,mozilla e.t.c)
Fully and easily customizable
Comes with jquery plugins.
My new website looks just like everyone else’s !
No backward compatibility in between versions
Using Bootstrap for existing websites is a tedious task.
You will likely not be earning any money for quite a while.
Why Use Bootstrap?
Easy to use : Anybody with just basic knowledge of HTML and CSS can start using Bootstrap.
Responsive features : Bootstrap’s responsive CSS adjusts to phones, tablets, and desktops.
Mobile-first approach : In Bootstrap, mobile-first styles are part of the core framework.
Browser compatibility : Bootstrap 4 is compatible with all modern browsers (Chrome, Firefox, Internet Explorer 10+, Edge, Safari, and Opera).