.link-overlay {
  // Force link to fill box.
  // Link must be first in container.
  // Container must have positioning other than static.
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 0;

  // Raise all other links above overlay link.
  ~ a,
  ~ * a {
    position: relative;
    z-index: 1;
  }
}


// That's it, From here on out are just page styles.


.module {
  position: relative; // important, needs positioning.
  width: 20em;
  margin: 1em auto;
  background: white;
  padding: 1em;
  box-shadow: 5px 5px rgba(#000, .5);
}

h2 {
  margin: 0;
}

body {
  background: #0B5C81;
  font-family: sans-serif;
}