html, body {
  margin: 0;
  padding: 0;
  background-color: #141414;
  
}

canvas {
  display: block;
  position: absolute;
  left: 50%;
  margin-left: -200px;
  top: 50%;
  margin-top: -200px;
}

::-moz-selection { /* Code for Firefox */
  color: rgb(30, 30, 30);
  background: rgb(230, 230, 230);
}

::selection {
  color: rgb(30, 30, 30);
  background: rgb(230, 230, 230);
}

.square {
  height: 408px;
  width: 408px;
  position: absolute;
  left: 50%;
  margin-left: -204px;
  top: 50%;
  margin-top: -204px;
  background-color: rgb(240, 240, 240);
}