I'm studing SASS and using twitter bootstrap
http://twitter.github.com/bootstrap/base-css.html#buttons
The twitter bootstrap is using Less, but i found a translation for SASS.
For the .btn there is
*border: 0; // Remove the border to prevent IE7's black border on input:focus
but the border is still there , if you see the twitter bootstrap buttons they are okay under IE . How they make that ?