Fork-Awesome/assets/less/site/newsletter.less

.jumbotron-ad #newsletter {
  .btn {
    color: @jumbotron-color;
    border-color: mix(@jumbotron-color, @jumbotron-bg, 75%);
    background-color: transparent;
    text-shadow: 0 1px 0 rgba(0,0,0,0.15);
    &:hover {
      background-color: mix(@jumbotron-color, @jumbotron-bg, 95%);
      border-color: mix(@jumbotron-color, @jumbotron-bg, 95%);
      color: @jumbotron-bg;
      text-shadow: 0 -1px 0 @jumbotron-color;
    }
  }
}