Bootstrap class: .bg-warning

You don't need to remember all these classes. Just use bootstrap builder instead.

• bg-primary
• bg-success
• bg-secondary
• bg-info
• bg-danger
• bg-light
• bg-dark
• text-success
• text-primary
• bg-white
• text-secondary
• text-info
• text-light
• text-danger
• text-dark
• text-white
• text-warning