body {
  background-color: lightblue;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100%;
  width: 100%;
}
html {
  margin: 0;
  padding: 0;
  height: 100%;
  width: 100%;
}
html,body {
  overflow: hidden;
}