*{
  margin: 0%;
  padding: 0%;
  box-sizing: border-box;
}
.thumbs {
  width: 100%;
  height: 350px;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  overflow-y: auto;
}

.thumbs_child {
  width: 100%;
  height: 100%;
  transition: 0.3s ease-in;
  position: relative;
  border: 5px solid white;
}

.thumbs-overlay {
  width: 100%;
  height: 100%;
  position: absolute;
}

.thumbs_child picture {
  min-width: 100%;
  min-height: 100%;
}

.thumbs_child picture img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

@media (min-width:1024px) {
  .thumbs{
    width: 100%;
    height: 100%;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
  }

  .thumbs_child{
    border: 3px solid white;
  }
}