How can I make the css style sheet appeared

I downloaded this theme, but nothing is appeared in style.css.
So I cannot edit my blog from css.
Please tell me how can I restore css of MonAmour, or please copy and paste
formal MonAmour css on this post.
thank you very much for your kind support!

Hi!
Please, download the theme again. You can simply reinstall the theme or find the file style.css in the archive with a theme and replace it.