Overriding hard-coded image caption widths in WordPress feeds

[rosefox]

This is extremely obscure, but in case it's been bugging anyone else who uses their reading page to read RSS feeds of WordPress blogs and occasionally suddenly has a page that's 10 million miles wide:

Add this to the CSS definitions section of your custom style.

.wp-caption {
max-width: 600px !important;
}

Problem solved.