body {
  background-color: black;
  margin: 0px;
  height: 100vh;
  width: 100vw;
  display: inline-block;
}
body header {
  color: white;
  display: flex;
  width: 100%;
  justify-content: center;
  align-items: center;
}
body main {
  color: white;
}
body footer {
  color: white;
  display: flex;
  justify-content: center;
  align-items: center;
}