.image-gallery-attachments {
  background: #fff;
  float: left;
  clear: both;
}

.image-gallery-thumbnail-wrapper {
  float: left;
  width: 19%;
  height: 45px;
  padding: 0.5%;
  overflow: hidden;
}

.image-gallery-thumbnail-wrapper img {
  height: auto;
  width: 100%;
  float: left;
}