.imgContainer{
  display: flex;
  flex-wrap: wrap;
  border: 50px;
}

.imgContainer > div > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  
}

.imgContainer > .big{
  flex: 1 1 49%;
  margin:  0.5%;
}

.imgContainer > .normal{
  flex: 1 1 49%;
  margin:  0.5%;
}