* {
  box-sizing: border-box;
}

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


.main-column-left {
  padding: 5em;
  float: left;
  width: 50%;
  background: red;
  overflow-y: scroll;
  height: 100vh;
}

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

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

ul {
  list-style-type: none;
  text-decoration: none;
}

.nav-top {
  height: 1.5em;
  background: white;
  width: 100%;
  display: inline-block;
  position: fixed;
  border: 0.1em black solid;
}

.nav-bottom{
  height: 1.5em;
  background: white;
  width: 100%;
  display: inline-block;
  bottom: 0;
  position: fixed;
  border: 0.1em black solid;
  z-index: 10000;
}

.nav-buttons {

}