The problem with hoarding is you end up living off your reserves. Eventually, you’ll become stale. If you give away everything you have, you are left with nothing. This forces you to look, to be aware, to replenish. . . . Somehow the more you give away, the more comes back to you.
Paul Arden

cross-fade()

The cross-fade() CSS function can be used to blend two or more images at a defined transparency. It can be used for many simple image manipulations, such as tinting an image with a solid color or highlighting a particular area of the page by combining an image with a radial gradient.
cross-fade() css reference