Answers for "smoother box shadow"

css super smooth shadow

/*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)

multilayer shadow in css

/* Default box-shadow */
.box {
  box-shadow: 0 3px 3px rgba(0,0,0,0.2);
}

/* Create smoother box-shadows by layering multiple
 * shadows with gradually increasing radius and offset */
.shadow-5 {
  box-shadow: 0 1px 1px rgba(0,0,0,0.12), 
              0 2px 2px rgba(0,0,0,0.12), 
              0 4px 4px rgba(0,0,0,0.12), 
              0 8px 8px rgba(0,0,0,0.12),
              0 16px 16px rgba(0,0,0,0.12);
}