How to specify a link to the current background?

Question

css

How to reference the current background-color with the lighten() function?
For example, there are 3 colors: red, green, blue - and all of them are the background of individual elements. How to make each of them brighter without rewriting each style separately? Tipo:

.block1
  background-color: red

.block2
  background-color: green

.block3
  background-color: blue

.block1, .block2, .block3
  &:hover
    background-color: lighten(*текущий цвет*, 10%)