html {
    background-color: #000011;
    color: #007777;
    padding: 0px;
    margin: 0px;
    font: 16px verdana, arial, sans-serif;
    margin: auto;
    text-align: center;
}

.centered {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}