Bootstrap Button
Bootstrap provides 7 different style classes for button. These are:
The button classes can be used on an <a>, <button>, or <input> element:
Button Sizes
Large Button with btn-lg class
Medium size Button (default)
Small size Button with btn-sm
Extra Small size Button with btn-xs
Block Level Buttons
A Block level button will expand the width to 100 percent. To create a block level button add ".btn-block" class.
Syntax:
<button class="btn btn-danger btn-block">Full width Button Block.</button>
Active/Disabled Buttons
A button can be set to an active using ".active" class or a disabled button using ".disabled" class.
Syntax:<button type="button" class="btn btn-danger active">Active Button</button>
<button type="button" class="btn btn-danger disabled">Disabled Button</button>