Use grayscale() CSS function that converts the input element to grayscale.
backdrop-gray-0
backdrop-gray-5
backdrop-gray-10
backdrop-gray-20
backdrop-gray-25
backdrop-gray-30
backdrop-gray-40
backdrop-gray-50
backdrop-gray-60
backdrop-gray-70
backdrop-gray-75
backdrop-gray-80
backdrop-gray-90
backdrop-gray-95
backdrop-gray-100