<div class="two_cols_container">
  <div class="two_cols">
    <div class="left-col">
      test
    </div>
    <div class="right-col">
      test
    </div>
  </div>
</div>

.two_cols_container {
  width: 100%;
  height: 100%;
}
.two_cols {
  position: relative;
  margin: 0 auto;
  border: 1px solid black;
  height: 100%;
  height: auto !important;
  min-height: 100%;
}
.two_cols .left-col {
  /*position: absolute;
    left: 0;*/
  float: left;
}
.two_cols .right-col {
  /*position: absolute;
    right: 0;*/
  float: right;
}