Overlays
To make a better contrast between texts and image, it's better to use overlay helper classes with banners. You can use either .overlay-black or .overlay-white with your banner.
Small
Uses .banner-sm class.
Default
It's default size, doesn't require any class.
Large
Uses .banner-lg class.
Full height
Uses .banner-full-height class.
Phones
Due to lack of enough space, banner size will be full height in phones.
Variations
Apart from size varieties, you can make different type of variations.
