body {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  background: #fff;
  color: #111;
  text-align: center;
}

body.dark {
  background: #0f1115;
  color: #eee;
}

header {
  padding: 30px;
}

nav {
  display: flex;
  justify-content: center;
}

.nav-center button {
  background: none;
  border: none;
  font-size: 1rem;
  margin: 0 16px;
  cursor: pointer;
  color: inherit;
}

.theme {
  font-size: 1.1rem;
}

main {
  max-width: 760px;
  margin: auto;
  padding-top: 60px;
}

.page {
  display: none;
}

.page.active {
  display: block;
}

.avatar {
  width: 190px;
  border-radius: 50%;
  margin-bottom: 30px;
}

h1 {
  font-size: 2.6rem;
  margin-bottom: 16px;
}

.intro {
  font-size: 1.15rem;
  margin-bottom: 14px;
}

.icons a {
  margin: 0 14px;
  font-size: 1.6rem;
  color: inherit;
}

h2 {
  font-size: 2rem;
  margin-bottom: 18px;
}

h3 {
  margin-top: 30px;
}

ul {
  list-style: none;
  padding: 0;
  line-height: 1.8;
}