.thumbnail {
  width: 100%;
  height: 100%;
}

.thumbnail:hover {
  transform: scale(1.2);
  -webkit-transition-property: all;
  -webkit-transition-duration: 0.3s;
  -webkit-transition-timing-function: ease;
}

#imagem {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

#thumbnail {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  transition: transform 0.3s;
}