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-0filter-opacity-5filter-opacity-10filter-opacity-20filter-opacity-25filter-opacity-30filter-opacity-40filter-opacity-50filter-opacity-60filter-opacity-70filter-opacity-75filter-opacity-80filter-opacity-90filter-opacity-95filter-opacity-100