JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/foundation/6.3.1/css/foundation.min.css">
<div class="wrapper">
  <div class="header row">
    <div class="large-6 columns">
      <h1>
        HEADER
      </h1>
    </div>
    <div class="large-6 columns">
      <h1>
        menu
      </h1>
    </div>
  </div>

  <div class="row">
    <div class="large-5 none show-for-medium columns info">
     Some information to the left
    </div>
    <div class="large-7 columns">
      <div class="image-container">
        <div class="image">
           image to the right
        </div>
      </div>
    </div>
  </div>
</div>

CSS

.wrapper {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  width: 100%;
  border: 1px solid black;
  background-color: #ccc;
}

.row {
    width: 100%;
}

.header {
  background-color: green;
}

.info {
  background-color: yellow;
  border: 1px solid #ccc;
}

.image-container {
  border: 1px solid black;
  display: flex;
}

.image {
  background-color: red;
  flex-grow: 1;
  width: 100%;
}



/************* NEW ***************/

div.wrapper > div:not(.header).row {
    flex: 1;                         /* 1 */
    display: flex;                   /* 1 */
}

div.large-7.columns {
    display: flex;                   /* 2 */
}

div.image-container {                /* 3 */
     flex: 1;
}

div.large-5.show-for-medium {       /* 4 */
     align-self: flex-start;
}