I have the following CSS code. For some reason, the background-color is not working. can somebody pls help?

```
<!DOCTYPE HTML>
<!--Inform the Browser that the document is HTML-->
<html  lang="en-US">

<head>
<meta charset="UTF-8">

<head>

<style type="text/css">

.leftpane{

width: 20%;
height: 80%;
border-color: brown;
border-width: .25em;
border-style: double;
float: left;
margin-right: 1em
background-color: orange;

}

</style>
<title>Trying CSS </title>
</head>

<body>

<div class="leftpane">
hi hi hi
<br/>
</div>

</body>

</html>

```