Use sepia() CSS function that converts the input element to sepia, giving it a warmer, more yellow/brown appearance.
backdrop-sepia-0
backdrop-sepia-5
backdrop-sepia-10
backdrop-sepia-20
backdrop-sepia-25
backdrop-sepia-30
backdrop-sepia-40
backdrop-sepia-50
backdrop-sepia-60
backdrop-sepia-70
backdrop-sepia-75
backdrop-sepia-80
backdrop-sepia-90
backdrop-sepia-95
backdrop-sepia-100