#thumbnails{
  width: 320px; 
}

#thumbnails img{
  margin-right: 5px;
  margin-bottom: 5px;
  border: 2px solid black;
  cursor: pointer;
}

#bigcell{
  vertical-align: middel;
  text-align: center; 
}

#big{
  border: 2px solid black;
}