email body background color not being set

I'm trying to set the email body background-color for a campaign but it isn't working:

```
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>test</title>
    <style>
         body {
            background-color: #000;
            color: #aaa;
        }

    </style>
</head>
<body>
    test
</body>
</html>
```


this does nothing.