.product-thumbnail {
  max-width: 100%;
}

.wrapper-img {
  display: block;
  width: 100px;
  margin: 0 auto;
  padding: 25px 0;
}

.product-thumbnail.free {
  background-color: #b5ce00;
  border-bottom: 4px solid  #9db300;
}

.product-thumbnail.premium {
  background-color: #fcc331;
  border-bottom: 4px solid  #f1a520;
}

.product-type-grouped .product-thumbnail.free {
    background-color: transparent;
    border: none;
}

.product-type-grouped .wrapper-img {
    width: 100%;
    padding: 0;
}

.woocommerce ul.products {
  margin-top: 2em;
}