.option_item {
  display: flex;
  flex-wrap: wrap;
}

.option_item li {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex: 0 0 50%;
  margin-bottom: 20%;
}

.option_item li .imgBox {
  width: 120px;
}

.option_item li .imgBox img {
  display: block;
  max-width: 100%;
  height: auto;
  border: 2px solid transparent;
}

.option_item li .imgBox img.selected {
  border: 2px solid #5566e9;
  border-radius: 50%;
}
