android.moparisthebest.org/.themes/classic/sass/partials/_sharing.scss

@mixin social-button-bg($img, $color: #444) {
  color: $color;
  &:visited, &:hover, &:visited:hover { color: $color; }
  position: relative;
  padding-left: image-width($img) + 6px;
  &:before {
    content: "";
    background: image-url($img) no-repeat center center;
    width: image-width($img);
    height: image-height($img);
    display: inline-block;
    position: absolute; left: 3px;
    top: 3px;
  }
}

.simple-social-button {
  display: inline-block;
  border: 1px solid #ccc;
  background-color: #e5e5e5;
  @include background-image(linear-gradient(#fff, #ddd));
  &:hover {
    @include background-image(linear-gradient(#f5f5f5, #ccc));
    border-color: #b5b5b5;
    background-color: #ddd;
  }
  padding: .2em .5em .1em; line-height: 1.45em;
  font-size: 13px;
  font-weight: bold;
  text-decoration: none;
  text-shadow: #fff 0 1px;
  @include border-radius(.3em);
}

.sharing {
  p.meta + & {
    padding: { top: 1em; left: 0; }
    background: $img-border top left repeat-x;
  }
}

#fb-root { display: none; }

.googleplus-share {
  @extend .simple-social-button;
  @include social-button-bg('googleplus.png', #db583b);
}
.facebook-share {
  @extend .simple-social-button;
  @include social-button-bg('facebook.png', #4e5a9b);
}
.twitter-share, .sidebar a.twitter-follow-button {
  @extend .simple-social-button;
  @include social-button-bg('twitter.png');
}