How to remove the quotation mark in the testimonial area

I put an article in the testimonial area of the theme as a sort of "sticky post" But the quote mark in the title (") looks funny. How do I remove it? I have tried to edit the script but I messed up the whole front page of the website so I restored the original tags. Pls check it here: http://norwichadventistchurch.org.uk/

 

Paste this code in Custom CSS
Appearance > Theme Option > Styling Option > Custom CSS

Code:

blockquote {
background: none;
}

 

Thank you sir! It's gone now!