I've tried marking up a letter, and I'm wondering why when I use span class, css is not implemented (date doesn't move to the left), but when I use div class, css is implemented. (date moves to the left). I assumed both should work but one is a block level element and the other is an inline. I changed this line: 

```
<div class="receiver-column"> 20 January 2016 </div> 

```

to

```
<span class="receiver-column">20 January 2016 </span>

```

Heres the html code: 

```css
body {
  max-width: 800px;
  margin: 0 auto;
}

.receiver-column {
  text-align: right;
}

h1 {
  font-size: 1.5em;
}

h2 {
  font-size: 1.3em;
}

p,
ul,
ol,
dl,
address {
  font-size: 1.1em;
}

p,
li,
dd,
dt,
address {
  line-height: 1.5;
}
```

```html
<p class="receiver-column"><strong>Dr. Eleanor Gaye </strong> Awesome Science faculty <br> University of Awesome <br> Bobtown, CA 99999, <br> USA <br>
  <strong>Tel</strong>: 123-456-7890 <br>
  <strong>Email</strong>: no_reply@example.com </p>

<div class="receiver-column"> 20 January 2016 </div>
```