body {
  margin: 40px auto;
  max-width: 650px;
  line-height: 1.6;
  font-size: 18px;
  color: #333;
  padding: 0 20px;
  background: #f8f8f8;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
h1,
h2,
h3 {
  line-height: 1.3;
  margin-top: 1.5em;
}
h1 {
  text-align: center;
  font-size: 3em;
}
a {
  color: #344080;
  text-underline-offset: 2px;
}
a:hover {
  color: #5c0066;
  /* background-color: #8200aa; */
}
hr {
  border: none;
  border-top: 1px solid #ccc;
  margin: 2em 0;
}
::selection {
  background: #ffffcc;
}

header {
  display: flex;
  justify-content: space-between;
}

.footer {
  text-align: center;
  font-size: 0.7em;
  color: #666;
  margin-top: 2em;
}