Gist — how to set the height and width of an embedded Gist

Question

For purposes of embedding very long Gists from Github in a Wordpress blog, what code will permit me to set the height so that vertical scroll-bars are generated? Something

Answer 1

None of the above answers work anymore. Here is the updated CSS that displays the gist correctly with visible scrollbars where needed.

.gist {
   max-width:350px;
   overflow:auto;
}

.gist .blob-wrapper.data {
   max-height:200px;
   overflow:auto;
}

See this blog post for example: How to set custom height and width of embedded Github Gist.