html {
  height: 100%;
}

body {
  height: 100%;
}

body>header {
  position: fixed;
  top: 0;
  width: 100%;
  max-width: 100%;
}

nav, article footer nav {
  display: none;
}

body>footer {
  position: fixed;
  bottom: 0;
  width: 100%;
  max-width: 100%;
}

article {
  background-color: red;
  height: 87%;
}

article footer {
  background-color: red;
}

hr.projection_first_page {
  margin-bottom: 100px;
  margin-bottom: 110px;
}