body {
  background-color: #fff;
  margin: 0;
  padding: 0;
}

.container {
  width: 100vw;
  height: 100vh;
  background-color: #404040;
}

.container img {
  position: relative;
  top: 50%;
  -webkit-transform: translateY(-50%);
  -ms-transform: translateY(-50%);
  transform: translateY(-50%);
}