@import url('https://fonts.googleapis.com/css2?family=Roboto+Slab&display=swap');

body, html {background-color:#000;
color:#fff;
font-family: 'Roboto Slab', serif;
font-size: 24px;
}

/*
.container {
  height: 1000px;
  position: relative;
  border: 3px solid green;
}


.center {
  margin: 0;
  position: absolute;
  top: 50%;
  left: 50%;
  -ms-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
}
*/

.centered {
  position: fixed; /* or absolute */
  top: 50%;
  left: 50%;
  /* bring your own prefixes */
  transform: translate(-50%, -50%);
}