* {
  box-sizing: border-box;
}

body{
  margin: 0;
  height: 100vh;
}


.main-column-left {
  padding: 2em 1em;
  float: left;
  width: 50%;
  background: red;
  overflow-y: scroll;
  height: 100vh;
}

.main-column-right {
  padding: 2em 1em;
  float: right;
  width: 50%;
  background: purple;
  overflow-y: scroll;
  height: 100vh;
}

.main:after {
    content: "";
    display: table;
    clear: both;
}

div.nav-bottom ul, div.nav-top ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
}

li a.nav-button {
  display: block;
  text-decoration: none;
  padding: 0.25em;
  font-family: sans-serif;
  float: left;
  width: 33.33%;
}

.nav-top {
  height: 1.5em;
  background: white;
  width: 100%;
  position: fixed;
}

.nav-bottom{
  height: 1.5em;
  background: white;
  width: 100%;
  bottom: 0;
  position: fixed;
  z-index: 10000;
}

a.librarian-names, a.file-names {
  text-decoration: none;
  padding: 0.3em;
  color: black;
}

a.librarian-names:hover, a.file-names:hover {
  color: white;
}


.file-names-container {
  /* IE 9 */
  -ms-transform: rotate(-90deg) translate(-78%, 0%);
  /* Safari */
  -webkit-transform: rotate(-90deg) translate(-78%, 0%);
  /* Standard syntax */
  transform: rotate(-90deg) translate(-80%, 0%);
  transform-origin: top left;

}