body {
  font-family: sans-serif;
}

h1 {
  text-align: center;
}

nav {
  display: flex;
  justify-content: center;
}
nav a {
  display: block;
  margin: 4px;
  font-size: 18pt;
}

main.full {
  display: flex;
  justify-content: center;
}
main.full fieldset {
  margin: 8px;
}
main.full canvas {
  margin: 16px;
  position: relative;
  width: 400px;
  height: 400px;
  border: 2px solid black;
}

main.simple {
  text-align: center;
  margin: 10px;
}
main.simple button {
  margin: 2px;
}
main.simple div {
  margin: 2px auto;
  text-align: left;
  width: 350px;
}

main.text {
  text-align: center;
}
main.text textarea {
  display: block;
  margin: 8px auto;
  width: 500px;
  height: 500px;
}
main.text button {
  margin: 8px;
}

a.source {
  position: absolute;
  top: 4px;
  right: 4px;
}