I need to apply this code to checkout page:
This hide the sticky menu and the float contact us module from the checkout.
How can I apply this only to the checkout page?
I already tried to create "app/design/frontend/your-store/your-theme/Magento_Checkout/web/css/source/_extend.less"
where "_extend.less" file contains the CSS above, but in this way, the style is applied to the whole site.
I need to have that code only on during checkout.