Reddit Help

---
HTML
---

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <link type="text/css" rel="stylesheet" href="stylesBig.css" media="screen">
    <link href="https://fonts.googleapis.com/css?family=Montserrat:100,100i,200,200i,300,300i,400,400i,500,500i,600,600i,700,700i,800,800i,900,900i" rel="stylesheet">
    <title>G</title>
  </head>

  <body>

  <a name="top"></a>

  <div id="a">
    <div id="box">
        <p>aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa<br/>a<br/>a<br/>a<br/>a<br/>a<br/>a<br/>a<br/>a<br/>a<br/>a<br/>a<br/>a<br/>a<br/>a<br/>a<br/>a<br/>a<br/>a<br/>a<br/>a<br/>a<br/>a<br/>a<br/>a<br/>a<br/>a<br/>a<br/>a<br/>a<br/>a<br/>a<br/>a<br/>a<br/>a<br/>a<br/>a<br/>a<br/>a<br/>a<br/>a<br/>a<br/>
        </p>
    </div>
  </div>

  <div id="b">
    <img src="image.png" style="width: 100%;"/>
    <div id="backToTop"><a id="backToTop" href="#top">back to top</a></div>
  </div>

  </body>

</html>


---
CSS
---

html, body {
  padding: 0;
  margin: 0;
  background-color: #FFF;
  color: #000;
  display: flex;
  font-family: Montserrat;
}

div#a {
  position: fixed;
  width: 40%;
  height: 100%;
}

  div#box {
    position: absolute;
    width: 70%;
    height: 100%;
    margin: auto 0;
    background-color: #FFFAAA;
  }

div#b {
  position: relative;
  width: 60%;
  height: 100%;
  margin-left: 40%;
  background-color: #000;
}

  div#backToTop {
    position: fixed;
    width: auto;
    height: 30px;
    right: 20px;
    bottom: 20px;
    background-color: rgba(0, 0, 0, 0.4);
    border-radius: 5px;
  }

  a#backToTop {
    text-decoration: none;
    font-size: 15px;
    color: #FFF;
    padding: 10px;
    vertical-align: middle;
    line-height: 30px;
  }