poky/bitbake/lib/toaster/toastergui/templates/customise_btn.html

<button class="btn btn-default btn-block layer-exists-{{data.layer_version.pk}} customise-btn"  data-recipe="{{data.pk}}"
    {% if data.layer_version.pk not in extra.current_layers %}
    style="display:none;"
    {% endif %}
  >
  Customise
</button>
<button class="btn btn-default btn-block layer-add-{{data.layer_version.pk}} layerbtn"
    data-layer='{ "id": {{data.layer_version.pk}}, "name":  "{{data.layer_version.layer.name}}",
      "layerdetailurl": "{%url 'layerdetails' extra.pid data.layer_version.pk%}",
      "xhrLayerUrl": "{% url "xhr_layer" extra.pid data.layer_version.pk %}"}'
    data-directive="add"
    {% if data.layer_version.pk in extra.current_layers %}
    style="display:none;"
    {% endif %}
  >
  <i class="glyphicon glyphicon-plus"></i>
  Add layer
</button>