html, body {
  height: 100%;
}

body {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: center;
  background: black;
  overflow: hidden;
}

.main {
  display: flex;
  height: 100%;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}