* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: sans-serif;
  font-size: 17px;
  line-height: 1.6;
  color: #1e1e1e;
  background: #ffffff;
  padding: 2rem 1rem;
}

.container {
  max-width: 680px;
  margin: 0 auto;
}

header {
  margin-bottom: 1.5rem;
}

h1 {
  font-size: 20px;
  font-weight: normal;
  color: #1e1e1e;
  margin-bottom: 0.4rem;
}

.tagline {
  color: #1e1e1e;
  margin-bottom: 0.75rem;
}

nav {
  font-size: 17px;
}

nav a {
  color: #0969da;
  text-decoration: none;
}

nav a:hover {
  text-decoration: underline;
}

hr {
  border: none;
  border-top: 1px solid #d0d0d0;
  margin: 1.5rem 0;
}

section {
  margin-bottom: 0.5rem;
}

h2 {
  font-size: 17px;
  font-weight: normal;
  color: #1e1e1e;
  margin-bottom: 0.4rem;
}

h2 a {
  color: #0969da;
  text-decoration: none;
}

h2 a:hover {
  text-decoration: underline;
}

p {
  color: #1e1e1e;
  font-size: 17px;
}