add default theme

resources/admin_themes/default/scss/bootstrap/utilities/_display.scss

@@ -0,0 +1,26 @@
+// stylelint-disable declaration-no-important
+
+//
+// Utilities for common `display` values
+//
+
+@each $breakpoint in map-keys($grid-breakpoints) {
+  @include media-breakpoint-up($breakpoint) {
+    $infix: breakpoint-infix($breakpoint, $grid-breakpoints);
+
+    @each $value in $displays {
+      .d#{$infix}-#{$value} { display: $value !important; }
+    }
+  }
+}
+
+
+//
+// Utilities for toggling `display` in print
+//
+
+@media print {
+  @each $value in $displays {
+    .d-print-#{$value} { display: $value !important; }
+  }
+}