this is smooth gradient mixin for sass.

_smooth gradient.scss

@mixin smooth-gradient($direction, $from, $to) {
  background-color: $to;
  background-image: linear-gradient($direction,
    rgba($from, 1) 0%,
    rgba($from, 0.738) 19%,
    rgba($from, 0.541) 34%,
    rgba($from, 0.382) 47%,
    rgba($from, 0.278) 56.5%,
    rgba($from, 0.194) 65%,
    rgba($from, 0.126) 73%,
    rgba($from, 0.075) 80.2%,
    rgba($from, 0.042) 86.1%,
    rgba($from, 0.021) 91%,
    rgba($from, 0.008) 95.2%,
    rgba($from, 0.002) 98.2%,
    rgba($from, 0) 100%
  )
}