body {
  min-width: 30rem;
}

header {
  height: 13rem;
}

header #logo {
  height: 4rem;
  margin: 0 auto;
  padding: 4.5rem;
}

#menu-button {
  display: block;
  position: absolute;
  width: 2.4rem;
  height: 2.4rem;
  padding: 0;
  margin: 5.3rem 3rem;
  border: none;
  background-color: transparent;
  background-image: url(/images/menu-button.svg);
  opacity: 0.5;
}

#menu-button:hover, #menu-button:active {
  opacity: 0.75;
}

#main-navigation {
  position: fixed;
  width: 100%;
  max-width: 32rem;
  height: calc(100% - 13rem);
  top: 13rem;
  transform: translateX(-100%);
  transition: transform 0.2s ease;
  z-index: 1;
}

#main-navigation.expanded {
  transform: translateX(0);
}

#main-navigation li {
  display: block;
  width: 100%;
}

#main-navigation a {
  display: block;
  height: 6rem;
  line-height: 6rem;
  padding: 0;
  margin: 0;
  text-align: left;
  padding: 0 3rem;
}

#main-navigation a:hover {
  background-color: #4d4d4d;
}

#main-navigation a.selected {
  background-color: #4d4d4d;
}