Use opacity() CSS function that applies transparency to the samples in the input element. There is an alternative Opacity utility you can use instead.
filter-opacity-0
filter-opacity-5
filter-opacity-10
filter-opacity-20
filter-opacity-25
filter-opacity-30
filter-opacity-40
filter-opacity-50
filter-opacity-60
filter-opacity-70
filter-opacity-75
filter-opacity-80
filter-opacity-90
filter-opacity-95
filter-opacity-100