BORDER SPINNERS
Use the border spinners for a lightweight loading indicator..
GROWING Color
If you don’t fancy a border spinner, switch to the grow spinner. While it doesn’t technically spin, it does repeatedly grow!
ALIGNMENT
Use flexbox utilities or text alignment utilities to place spinners exactly where you need them in any situation.
Size
Add .spinner-border-sm and .spinner-grow-sm to make a smaller spinner that can quickly be used within other components.
Button Spinner
Use spinners within buttons to indicate an action is currently processing or taking place. You may also swap the text out of the spinner element and utilize button text as needed..
Button Grow
Use spinners within buttons to indicate an action is currently processing or taking place. You may also swap the text out of the spinner element and utilize button text as needed..