skouter/grav-admin/user/themes/quark/scss/spectre/_empty.scss

// Empty states (or Blank slates)
.empty {
  background: $bg-color;
  border-radius: $border-radius;
  color: $gray-color-dark;
  text-align: center;
  padding: $unit-16 $unit-8;

  .empty-icon {
    margin-bottom: $layout-spacing-lg;
  }

  .empty-title,
  .empty-subtitle {
    margin: $layout-spacing auto;
  }

  .empty-action {
    margin-top: $layout-spacing-lg;
  }
}