Hi, welcome back!
ButtonsButtons
Default button style
Outline Buttons
Default outline button style
Button Sizes
add .btn-lg .btn-sm .btn-xs to change the style
Outline Button Sizes
add .btn-lg .btn-sm .btn-xs to change the style
Rounded Buttons
add .btn-rounded to change the style
Rounded outline Buttons
add .btn-rounded to change the style
Button Right icons
add .btn-icon-right to change the style
Button Left icons
add .btn-icon-left to change the style
Square Buttons
add .btn-square to change the style
Square Outline Buttons
add .btn-square to change the style
Rounded Button
add .btn-rounded to change the style
Rounded outline Buttons
add .btn-rounded to change the style
Dropdown Button
Default dropdown button style
Disabled Button
add disabled="disabled" to change the style
Socia icon Buttons with Name
add .btn-facebook, .btn-twitter, .btn-youtube... to change the style