discourse/app/assets/stylesheets/common/admin/customize_themes_show_schema.scss

.customize-themes-show-schema {
  &__header {
    margin-bottom: 1em;
  }

  &__back {
    display: flex;
    align-items: center;
    gap: 0.25em;
    color: var(--tertiary);
    .d-icon {
      font-size: var(--font-down-1);
      color: currentColor;
    }
  }
}