body {
  padding: 0;
  margin: 0;
  overflow: hidden;
}
html,
body {
  height: 100%;
  background-color: lightGray;
}
.page {
  position: fixed !important;
  top: 0;
  bottom: 0;
  left: 0px;
  right: 0px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 30px;
}