html { height: 100%; }

body {
  min-height: 100%;
  margin: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #313;
  color: white;
  font-family: sans-serif;
  font-size: 14px;
  text-align: center;
  cursor: move;
}

canvas {
  display: block;
  margin: 0px auto 20px;
}

a { color: #936; }
a:hover { color: #D65; }

button {
  background: #525;
  color: white;
  font-size: 14px;
  font-family: inherit;
  border: none;
  border-radius: 3px;
  padding: 8px 10px;
}

button:hover {
  background: #936;
  cursor: pointer;
}