bsolute;
  top: 0;
}

.inner {
  height: 100px;
  width: 120px;
  font: 16px/1.25 sans-serif;
  position: absolute;
  top: 0;
}

.lefthalf {
  border-right: 2px solid fuchsia;
  padding-right: 7px;
}

.righthalf {
  padding-left: 7px;
}

</style>

<div class="outer">
  <div class="inner lefthalf" style="left: 0">
    AAAAA<br>
    BBBBB<br>
    CCCCC<br>
    DDDDD<br>
    EEEEE
  </div>
  <div class="inner righthalf" style="left: 129px">
    FFFFF<br>
    GGGGG<br>
    HHHHH<br>
    IIIII<br>
    JJJJJ
  </