html {
  display: flex;
  flex-direction: column;
  height: 100%;
}

body {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-sizing: border-box;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
  padding: 20px;
  width: 700px;
  max-width: 100vw;
  margin: auto;
  font-size: 16px;
  line-height: 1.3;
}

h1 {
  font-size: 24px;
  font-weight: bold;
  margin-bottom: 16px;
}

h2 {
  font-size: 20px;
  font-weight: bold;
  margin-bottom: 8px;
}

h3 {
  font-size: 18px;
  font-weight: bold;
  margin-bottom: 8px;
}

a {
  color: inherit;
}

footer {
  margin-top: 100px;
}

footer ul {
  display: flex;
  justify-content: space-evenly;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 0.8rem;
}

footer ul > li {
  padding: 6px 12px;
}