RrwJxp

index.html

<div class="header">
  <h1>Header</h1>
</div>
<div class="main">
  <p>Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Donec quam felis, ultricies nec, pellentesque eu, pretium
    quis, sem. Nulla consequat massa quis enim. Donec pede justo, fringilla vel, aliquet nec, vulputate eget, arcu.</p>

   
</div>
<div class="footer">
     Last name: <input type="text" name="lname"><br>
    <div  contenteditable="true" placeholder="Type a message" spellcheck="false"  ">edit me contenteditable</div>
                                                                                   
                                                                                   END

  </p>
</div>

RrwJxp.markdown

RrwJxp

A Pen by coulix on CodePen.

License.

style.css

 body {
  font-family: Avenir, sans-serif;
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
  -webkit-flex-direction: column;
  -ms-flex-direction: column;
  flex-direction: column;
  padding: 0;
  margin: 0;
  min-height: 100vh;
}

div {
  width: 100%;
}

div p {
  margin-left: 1em;
  margin-right: 1em;
}

div.header {
  background-color: orange;
  text-align: center;
}

div.main {
  background-color: grey;
  -webkit-box-flex: 1;
  -webkit-flex: 1;
  -ms-flex: 1;
  flex: 1;
}

div.footer {
  color: white;
  background-color: blue;
}