body {
  background: #272b30;
  color: #fff;
  font-family: Arial, sans-serif;
  text-align: center;
  margin: 0;
  padding: 0;
}
h1 {
  margin-top: 24px;
  margin-bottom: 10px;
  letter-spacing: 2px;
}
#tankgame {
  background: #111;
  display: block;
  margin: 0 auto;
  border: 4px solid #48d1cc;
  box-shadow: 0 0 18px #222;
}
p {
  margin-top: 8px;
  font-size: 1em;
}