/* Estilo "switch-like" para BS3 (opcional) */
.billing-switch .btn {
  border-radius: 20px;
  padding: 6px 16px;
  transition: all .2s ease;
}
.billing-switch .btn + .btn {
  margin-left: 6px;
}
.billing-switch .btn-default {
  background: #f5f5f5;
  border-color: #ddd;
  color: #555;
}
.billing-switch .btn-primary {
  background: #337ab7;
  border-color: #2e6da4;
}