Fast help on CSS.. where is this line?

Hi buddy, congratulations for the great job!

I’m modding plugin CSS to better fit it on my template, but I don’t find this line:
http://mercadordeideias.com.br/files/yuzo_line.png

I want to take this line out.
Please, help me.. In which file/CSS is it?

Thx!
Guido

https://wordpress.org/plugins/yuzo-related-post/