.zone-smart-outer {
  max-width: 1380px;
  margin: 0 auto;
  overflow: hidden;
  position: relative;
}

.zone-smart-slider {
  display: flex;
  width: max-content; /* lascia che il track cresca */
  will-change: transform;
}

.zone-smart-track {
  display: flex;
  align-items: center;
  white-space: nowrap;
}

.zone-smart-item {
  flex: 0 0 auto;
  margin-right: 20px;
}

.zone-smart-item img {
  display: block;
  max-height:131px;
  width: auto;
  filter: grayscale(100%);
  opacity: 0.7;
  transition: filter 0.3s ease, opacity 0.3s ease;
}

.zone-smart-item:hover img {
  filter: grayscale(0%);
  opacity: 1;
}