How to display discounted sale price on product page and everywhere else?

[pranjal1]

I am on the dawn theme and I want to run a sitewide sale of 10% discount on all products.

I'm looking for a way to show the discounted sale price on the product cards and product page without changing the price and compare at price. 

Is there any way I can achieve this? I've tried running an automatic 10% discount code but the problem here is that the final discounted price shows on the checkout page whereas I want it to show everywhere on the site.

[RMithun]

You can add customize pop up button on every page or initiate one sticky bar on the top to show this in all pages

[Dan-From-Ryviu]

You can add that message in your announcement bar in your Online store > Themes > Customize