$darken-levels: (
        "10":                                               10%,
        "20":                                               20%,
        "30":                                               30%,
        "40":                                               40%,
        "50":                                               50%,
        "60":                                               60%,
        "70":                                               70%,
        "80":                                               80%,
        "90":                                               90%
);

@each $color, $value in $theme-colors {
  .bg-#{$color} {
    @each $darknes, $level in $darken-levels {
      &.lighten-#{$darknes} {
        background-color:                                   lighten($value, $level) !important;
      }
    }
  }
}
