body {
  font-family: sans-serif;
  font-size: 1.3em;
  margin-bottom: 15vh;
}

pre {
}

p {
  color: #333;
}

.box {
  width: 40px;
  height: 40px;
  background: dodgerblue;
  display: inline-block;
  border-radius: 4px;
}

.restart {
  margin-top: 20px;
  display: block;
}

.demo {
  padding-bottom: 20px;
  border-bottom: 1px dashed #ccc;
  opacity: 0;
}