body {
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  margin: 40px auto;
  max-width: 650px;
  padding:0 10px;
}

canvas {
  border-width: 1px;
  border-style: solid;
  border-color: black;
  cursor: crosshair;
  margin: 10px;
}

a:link,
a:visited {
  color: #55f;
}

a:hover {
  color: #555;
}