styles.css

@import url("https://fonts.googleapis.com/css2?family=Nanum+Pen+Script&display=swap");

html,
body {
  padding: 0;
  margin: 0;
}
body {
  background-color: #222;
  text-align: center;
  margin-top: 40px;
}
.preload {
  font-family: "Nanum Pen Script";
  position: absolute;
  opacity: 0;
  user-select: none;
}
canvas {
  background-color: #f6e5f5;
  box-shadow: 0 2px 8px #000;
  border-radius: 2px;
  transition-property: opacity;
  transition-duration: 0.1s;
  user-select: none;
}
footer {
  margin: 24px;
  display: inline-block;
  padding: 6px 12px;
  border-radius: 500px;
  background-color: rgba(0, 0, 0, 0.2);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.1), 0 1px 0 #000 inset;
  font-family: sans-serif;
  color: #888;
  font-size: 12px;
  cursor: default;
  user-select: none;
}
footer b {
  color: #000;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.1);
  margin: 0 4px;
}
a {
  color: #26a;
  text-decoration: none;
}
footer a:hover {
  color: #27d;
}

.green {
  color: #7accaf;
}
.yellow {
  color: #f5e4aa;
}
.red {
  color: #da7783;
}

header,
header a {
  font-family: "Nanum Pen Script";
  font-size: 60px;
  color: #7accaf;
  text-shadow: 0 2px 0 rgba(0, 0, 0, 0.5);
  margin: 24px;
}

main.help {
  max-width: 900px;
  margin: 0 auto;
}

section {
  margin: 10px;
  font-family: "Nanum Pen Script";
  font-size: 30px;
  color: #f6e5f5;
  text-shadow: 0 1px 0 rgba(0, 0, 0, 0.5);
}
section div {
  display: inline-block;
  vertical-align: middle;
  max-width: 320px;
  margin: 0 16px;
  text-align: left;
}
section canvas {
  vertical-align: middle;
  margin: 16px;
}