When I paste in an images URL from Flickr into a wordpress post it auto embeds it into the post. Somehow it is getting set to a default width of 500px. How/where do I change this? I just can't find any documentation for it, arg!
Note: I am using the twentyten theme.
EDIT:
To clarify, this is not a stylesheet issue.
If I paste this into a post:
http://www.flickr.com/photos/davebryan/5755930575/
Wordpress auto embeds it and changes it to this:
<img width="500" height="331" alt="" src="http://farm6.static.flickr.com/5267/5755930575_eee9e7c727.jpg">
Where is it getting the width and height?
It's auto-embedding http://codex.wordpress.org/Embeds using http://oembed.com via the file wp-includes/class-oembed.php
You can uncheck autoembedding in Administration > Settings > Media SubPanel and set maximum width and height.
You can also use a shortcode for size, i.e.: [embed width="123" height="456"]...[/embed]