// Tipos de displays
$displays: none, block, flex, inline, inline-block, inline-flex;

// Cria as classes de displays
@each $display in $displays {
  .d-#{$display} {
    display: $display !important;
  }
}

// Criar displays com breakpoints
@each $breakpoint in "sm", "md", "lg", "xl" {
  @include media-breakpoint-up($breakpoint) {
    @each $display in $displays {
      .d-#{$breakpoint}-#{$display} {
        display: $display !important;
      }
    }
  }
}