*, *:before, *:after {
  box-sizing: border-box;
}

body {
  background: url("https://static.pexels.com/photos/32237/pexels-photo.jpg");
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
}

a { text-decoration: none; }

.main-navigation {
  width: 100%;
  background: #000;
  padding: 10px;
}

.main-navigation.fixed {
  position: fixed;
  top: 0;
}

.main-navigation.fixed + .main-navigation_ph {
  height: 20px;
}

.main-navigation ul {
  list-style: none;
  margin: 0;
  padding: 0;
  max-width: 960px;
  margin: 0 auto;
}

.main-navigation ul li {
  display: inline-block;
  margin: 0 10px 0 0;
}

.main-navigation ul li a {
  text-decoration: none;
  color: #efd401;
}

.main-navigation ul li a:hover {
  text-decoration: underline;
  color: #d4bd07;
}

.site-banner {
  width: 100%;
  padding: 35vh 0 40px;
  min-height: 100vh;
}

.site-banner h1,
.site-banner h2 {
  text-align: center;
  color: white;
  text-shadow: black -2px 3px 0;
}

.site-banner h1 { font-weight: bold; }

@media (min-width: 550px) {
  .site-banner h1 { font-size: 7.5rem; }
}
.site-banner h2 { color: #efd401; }

.main-content {
  max-width: 960px;
  margin: 0 auto;
}
.main-content article {
  background: white;
  margin: 40px 0;
  padding: 60px 40px;
}

.site-footer {
  max-width: 960px;
  margin: 40px auto 0;
  background: white;
  padding: 10px 40px;
  
}

.site-footer span {
  font-size: 1.2rem;
}