How to adjust the width of a quote

I’ve played around with a shortcode for a quote here: http://pacura.ru/about/ and it seems to stretch to 100% of the width, while the quote itself is maybe only 30% – is this expected behavior?

Here is the behavior I expected to see, how could I achieve that or is it my theme interfering here? screen shot => http://screencast.com/t/J2zFmzNVncuG

https://wordpress.org/plugins/shortcodes-ultimate/