How can I replace existing template in odoo 14.

for ex, I'm trying to replace NumpadWidget in POS by writing following code.

<t t-name="NumpadWidget" t-inherit="point_of_sale.NumpadWidget" t-inherit-mode="extension" owl="1">

<xpath expr="//div[hasclass('numpad')]" position="replace">

<div class="numpad"></div>

</xpath >

</t>

------------

then I'm getting following error : A template should not have more than one root node.