The response descriptions are extremely hard to read against the background color. Here's the CSS changing the foreground color.
body, p, table, tr, td, .bodytext, .stepfield, .wiki-content p, .panelContent {
color: #333;
}
Adding something like this to the add-on CSS should solve the problem:
.swagger-ui .response-col_description p {
color: fff;
}
Here's a screen shot of what the problem looks like: