odoo-survey-addons/survey_input_template_custom/views/survey_survey.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>

  <record id="survey_survey_form" model="ir.ui.view">
    <field name="name">survey_input_template_custom survey.survey form</field>
    <field name="model">survey.survey</field>
    <field name="inherit_id" ref="survey.survey_form"/>
    <field name="priority">21</field>
    <field name="arch" type="xml">
      <field name="thank_you_message" position="before">
        <field name="thank_you_title" string="Page title"/>
      </field>
      <xpath expr="//notebook/page[descendant::field[@name='users_can_go_back']]" position="inside">
        <group col="4">
          <field name="start_btn_label"/>
          <field name="submit_btn_label"/>
        </group>
      </xpath>
      <xpath expr="//notebook/page[last()]" position="after">
        <page name="scss_style" string="SCSS style" groups="base.group_system">
          <div class="text-muted mb16">
            <i class="fa fa-exclamation-triangle text-warning"/>
            This SCSS stylesheet will be injected in the layout of user response to a survey. Be sure of what you do when you decide to modify this field.
          </div>
          <field name="scss_style" widget="ace" options="{'mode': 'scss'}"/>
        </page>
      </xpath>
    </field>
  </record>

</odoo>