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I've adjusted the most-specific style so that it will only apply to that section. I think it looks pretty good with these modifications. You could always use them as brainstorming for another idea, but I think this is a great start:
.full_topic .descr blockquote {
font-size: 1em;
color: #354472;
padding: 0.8em 1.5em;
margin: 1em;
}
Or you may want to throw-in a border-radius: 4px;
for a bit softer style if you prefer?