dawn theme: Sale % price shown next to former price on product page

[byrdsvintage]

Hi community! 
I want to have all the sales products shown like in the attached picture: that there is a sales badge in the left top corner, that the original price is crossed out and the new sales price is in the same color right next to it 🙂 
Im using dawn theme and here is my website: byrdsvintage.de
Hope you can help me out! Thanks in advance!