We need variables for alert background!

Created by: myplaneticket

Alert is changing the theme colors automatically:

@each $color, $value in $theme-colors {
  .alert-#{$color} {
    @include alert-variant(theme-color-level($color, -10), theme-color-level($color, -9), theme-color-level($color, 6));
  }
}

This is counter intuitive and should be changed. There should be variables for Alert backgrounds. Currently you have no control over this.