Add .custom-control .custom-checkbox as a single wrapper and add
.custom-control-label for better output.
To change the color of the Custom CheckBoxes, use the .bg-{colorName} with .custom-control-input class.
To change the color of the checkBox, use the checkbox-{colorName} for primary, secondary, success, danger, info, warning.
Use class .checkbox-glow class with .checkbox.checkbox-{colorName} for glow effect to Checkboxes. Glow shadow color will be changed according to Colored Checkboxes.
Use class .checkbox-shadow class with .checkbox for shadow effect to Checkboxes.
Use .checkbox-icon with .checkbox class to change the internal icon inside the checkbox.
To add a checkBox with different sizes, we have the .checkbox-sm class for small Checkboxes. Add it alongwith .checkbox class.