yocto-poky/bitbake/lib/toaster/toastergui/templates/pkg_add_rm_btn.html

<button class="btn btn-block btn-danger add-rm-package-btn" id="package-rm-btn-{{data.pk}}" data-directive="remove" data-package="{{data.pk}}" data-package-url="{% url 'xhr_customrecipe_packages' extra.recipe_id data.pk %}" style="
  {% if data.pk not in extra.current_packages %}
    display:none
  {% endif %}
  ">
  <i class="icon-trash no-tooltip"></i>
  Remove package
</a>
<button class="btn btn-block add-rm-package-btn" data-directive="add" id="package-add-btn-{{data.pk}}" data-package="{{data.pk}}" data-package-url="{% url 'xhr_customrecipe_packages' extra.recipe_id data.pk %}" style="
  {% if data.pk in extra.current_packages %}
    display:none
  {% endif %}
    ">
<i class="icon-plus"></i>
 Add package
</button>