7html, body {
  background-colour: black;
  color: white;
  height: 100%;
  margin: 0;
  min-height: 100vh
  }
body {
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
}
.container {
  /* optional spacing or max-width */
  padding: 20px;
  max-width: 800px;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}