CSS for blockquotes

I am trying to format the blockquote (text that appears when you quote another poster)

At the moment it is far too big.

I found this ibns the forum stylesheet

#af-wrapper blockquote {
font-size: inherit;
}

and changed it to

#af-wrapper blockquote {
font-size: 12px !important;
}

. . . but it is not making any difference.

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