Claymorphism-style CSS generator

box-shadow: inset 5.00px 8.66px 13.66px -1.71px rgba(0, 0, 0, 0.15),
  inset -7.50px -12.99px 13.66px -1.71px rgba(0, 0, 0, 0.3),
  15.00px 25.98px 10.25px -5.12px rgba(0, 0, 0, 0.6);