Problems with CSS for .wp-smiley

Hello Support,

I’m trying to change the border around smileys at Your theme.
I’ve tried in various ways but behaviour (border: 1px) is always inherited from #main #content img not from:
1. Custom CSS in Appearance
2. Custom CSS inside Simple Catch theme options
3. .wp-smiley {} inside the style.css of Your theme

I’ve tried code:

<code>.wp-smiley {border: 0}</code>
and
<code>img.wp-smiley {border: 0}</code>
and
<code>#main #content .wp-smiley {border:0}</code>

Please advise.