html {
  position:                 absolute;
  top:                      0;
  bottom:                   0;
  left:                     0;
  right:                    0;
}

body {
  position:                 relative;
}

main {
  position:                 absolute;
  top:                      0;
  bottom:                   0;
  left:                     0;
  right:                    0;
}

section {
  position:                 relative;
}