body {
  margin: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: #111;
  height: 100vh;
  flex-direction: column;
}

#gameCanvas {
  background: #000;
  display: block;
  border: 3px solid #fff;
}

#footer {
  margin-top: 10px;
  color: white;
  font-size: 14px;
  text-align: right;
  width: 100%;
  padding-right: 20px;
}