odoo16/addons/website_sale_stock/data/template_email.xml

<?xml version="1.0" ?>
<odoo>
    <template id="availability_email_body">
        <div id="body">
            <p>Dear Customer,</p>
            <p>The following product is now available.</p>
            <div style="display: flex; justify-content: center; width: 100%;">
                <a t-attf-href="#{product.website_url}">
                    <img t-attf-src="/web/image/product.product/#{product.id}/image_1920"/>
                </a>
            </div>
            <div style="display: flex; flex-direction: row; align-items: center; justify-content: center; width: 100%;">
                <p t-esc="product.name"/>
                <p t-if="product.product_template_attribute_value_ids"
                   style="margin-left: 0.5em;">
                    (<t
                    t-out="', '.join(product.product_template_attribute_value_ids.mapped('name'))"
                    />)
                </p>
                <p style="margin-left: 0.5em; margin-right: 0.5em">-</p>
                <p t-esc="product.list_price" t-options="{'widget': 'monetary', 'display_currency': product.currency_id}"/>
            </div>
            <p t-esc="product.description_sale"/>
            <div style="display: flex; justify-content: center; width: 100%;">
                <a t-attf-href="#{product.website_url}" style="background-color: #875A7B; padding: 8px 16px 8px 16px; text-decoration: none; color: #fff; border-radius: 5px; font-size:13px;">
                    Order Now
                </a>
            </div>
            <p>Regards,</p>
        </div>
    </template>
</odoo>