The idea for this post came because my blog’s new theme had borders on all smileys which looked a bit odd. So I thought why not make a post about it.

Open your theme’s style.css file and add this in last line:

img.wp-smiley{ 
  border:none;
}

That’s all. Nothing more. It will remove borders on all smileys and works with all themes in WordPress and for most versions of WordPress.