html, body {
  width: 100%;
  height: 100%;
  margin: 0;
  background-color: #333333;
  color: #fff;
}

#root, .App {
  width: 100%;
  height: 100%;
}

.App {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  flex: 1;
}