html {
  height: 100%;
  background: #000000;
  color: #aaaaaa;
  font-family: Arial, sans-serif;
}

body {
  height: 100%;
}
img {
  border: 0;
}

div.center {
  text-align: center;
  align: center;
}
img.center {
  margin-top: 5%;
}
img.turtle {
  margin-top: 5%;
  border: 1px solid #444444;
  padding: 4px;
}