@mixin alert-box($color) {
  $font-color: white;

  color: $font-color;
  background: $color;
  border: 2px solid rgba(0,0,0,0.1);
  border-color: lighten($color, 10%);
  text-shadow: 0 -1px rgba(0,0,0,0.3);
  @include border-radius(3px);
  padding: 0.5em;
  margin-bottom: 1em;
  a {
    font-weight: bold;
    @include link-colors(
      $font-color, $font-color, $font-color,
      $font-color, $font-color);
  }
}

@mixin alert-box($color) {
  $font-color: white;

  color: $font-color;
  background: $color;
  border: 2px solid rgba(0,0,0,0.1);
  border-color: lighten($color, 10%);
  text-shadow: 0 -1px rgba(0,0,0,0.3);
  border-radius: 3px;
  padding: 0.5em;
  margin-bottom: 1em;
  a {
    font-weight: bold;
    @include link-colors(
      $font-color, $font-color, $font-color,
      $font-color, $font-color);
  }
}

Remove border-radius mixin, now useless with the prefix module
Remove border-radius mixin, now useless with the prefix module
