Check out example codes for "css super smooth shadow". It will help you in understanding the concepts better.

Code Example 1

/*Super smooth shadow*/  
box-shadow:
  0 2.8px 2.2px rgba(0, 0, 0, 0.034),
  0 6.7px 5.3px rgba(0, 0, 0, 0.048),
  0 12.5px 10px rgba(0, 0, 0, 0.06),
  0 22.3px 17.9px rgba(0, 0, 0, 0.072),
  0 41.8px 33.4px rgba(0, 0, 0, 0.086),
  0 100px 80px rgba(0, 0, 0, 0.12)

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