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CSS Base

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              <div class="parent">
  <div class="child-1">
    <p><code>.child</code>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Voluptate, repellendus, quisquam consequatur obcaecati veniam distinctio saepe placeat eius asperiores fugiat illum cum libero incidunt. Facilis maxime earum unde! Eveniet, est!</p>
  <div class="child-2">

              html {
  box-sizing: border-box;
*, *:before, *:after {
  box-sizing: inherit;
.parent {
  display: table;
  width: 100%;
.child-1, .child-2 {
  display: table-cell;
.child-1 {
  width: 250px;

/* all css below here is for illustrative purposes */
.child-1, .child-2 {
  border: 1px solid #000;
  padding: 10px;
  min-height: 100px;
  background: #f2f2ab;
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