// Colori
$colore1 : #d3ffee
$colore2 : #beffff
$colore3 : #a1fdf9
$colore4 : #95feff
$colore5 : #7ffcfe
$colore6 : #71e4fe
$colore7 : #5f60fe
body
  background: #000
  display: flex
  height: 100vh
div
  width: 650px
  height: 650px
  background: #222
  margin: auto
  display: flex
  border-radius: 50%
  box-shadow: inset 5px 5px 50px black
  position: relative
span
  margin: auto
  width: 14px
  height: 14px
  border-radius: 50%
  box-shadow: 300px 0px 0px 0px $colore1, 300px 0px 15px 0px $colore1, 250px 0px 0px -1px $colore2, 250px 0px 15px -1px $colore2, 200px 0px 0px -2px $colore3, 200px 0px 15px -2px $colore3, 150px 0px 0px -3px $colore4, 150px 0px 15px -3px $colore4, 100px 0px 0px -4px $colore5, 100px 0px 15px -4px $colore5, 50px 0px 0px -5px $colore6, 50px 0px 15px -5px $colore6
i
  position: absolute
  top: 50%
  left: 50%
  border-radius: 50%
  background: rgba(0,0,0,.2)
  &:nth-child(2)
    width: 550px
    height: 550px
    margin: -275px 0 0 -275px
    box-shadow: inset 5px 5px 40px black
  &:nth-child(3)
    width: 450px
    height: 450px
    margin: -225px 0 0 -225px
    box-shadow: inset 5px 5px 35px black
  &:nth-child(4)
    width: 350px
    height: 350px
    margin: -175px 0 0 -175px
    box-shadow: inset 5px 5px 30px black
  &:nth-child(5)
    width: 250px
    height: 250px
    margin: -125px 0 0 -125px
    box-shadow: inset 5px 5px 25px black