html, body {
  margin: 8px;
  padding: 0;
  background: white; 
}


h1, h2, p {
  font-family: monospace;
  margin: 4px; 
}

h1 {font-size: 18px; margin-bottom: 8px; }
h2, p {font-size: 14px; }

canvas {
  display: block;
  margin: auto; 
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border: 1px black solid; 
}

#buttons {
  margin: 8px 0px;   
}

button {
  display: inline; 
  margin-right: 2px; 
  padding: 6px 12px; 
  border: none; 
  border-radius: 1px; 
  font-family: monospace; 
}