JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container">
  <div id="col1" class="column">
    <div class="absolute-menu">
      <div>1</div>
      <div>2</div>
      <div>3</div>
      <div>4</div>
      <div>5</div>
      <div>6</div>
      <div>7</div>
    </div>
  </div>
  <div id="col2" class="course-column">
    Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula     eget dolor. Aenean massa. 
    Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula     eget dolor. Aenean massa. 
  </div>
</div>
<div id="footer"></div>

CSS

#container {
  display:table;
}
#footer {
  width:100%;
  height:20px;
  background-color:white;
  border: 1px solid black;
}

.absolute-menu {
  position: absolute;
  overflow-y: auto;
  width: 100%;
  height: 100%
}
.column {
  display:table-cell;
  position: relative;
  vertical-align:top;
}
#col1 {
  width:25%;
  background-color:red;
}
#col2 {
  background-color:blue;
}