html,
body {
  height: 100%;
}

a {
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

header {
  background-color: #75787b;
  text-align: center;
  width: 100%;
}

header h1 {
  display: inline-block;
  margin: 2rem 0;
  padding: 1rem;
}

header h1 a,
header h1 a:hover,
header h1 a:focus {
  color: #fff;
  text-decoration: none;
}

nav {
  margin-top: 2rem;
  text-align: center;
}

nav ul li {
  display: inline;
  margin: 0 1rem;
}

nav a {
  font-size: 2rem;
}

.container {
  margin-top: 4rem;
  max-width: 680px;
}

h2 {
  border-bottom: 1px solid #eee;
  padding-bottom: 9px;
}

ul {
  list-style-type: none;
}

ul.posts .posted-at {
  color: #999;
  float: right;
  font-size: 1.2rem;
}

iframe {
  margin-bottom: 5rem;
}