back button for new application member modal

js/components/forms/multi_step_modal_form.js

@@ -47,6 +47,9 @@ export default {
         this.step += 1
       }
     },
+    previous: function() {
+      this.step -= 1
+    },
     goToStep: function(step) {
       if (this._checkIsValid()) {
         this.step = step

styles/elements/_action_group.scss

@@ -21,4 +21,9 @@
   &:last-child {
     margin-bottom: $gap * 3;
   }
+
+  .action-group__action--left {
+    margin-left: 0;
+    margin-right: auto;
+  }
 }

templates/fragments/applications/add_new_application_member.html

@@ -118,6 +118,11 @@
         form="add-app-mem"
         value='Invite member'>
       <a class='action-group__action icon-link icon-link--default' v-on:click="closeModal('{{ new_port_mem }}')">Cancel</a>
+      <input
+          type='button'
+          v-on:click="previous()"
+          class='action-group__action usa-button action-group__action--left'
+          value='Previous step'>
     </div>
   </div>
 {% endset %}