How can I make my content of my page centered and not all to the left?


Code:
body {
    margin:0 0 20px;
    background-color:#fcfcfc;
 }
#container {
    position:relative;
    
    min-height:472px;
    padding:80px 0 48px;
    margin:auto;
    background-color:#6b90bd;
    background-image:url(../images/headAndShoulders.jpg);
    background-repeat:no-repeat;
    box-shadow:10px 10px 10px #666;
 }
.header {
    padding:0 0 0 334px;
    font-family:georgia,'times new roman',times,serif;
    font-style:italic;
    color:#333;
 }
#nav {
    padding:0;
    margin:0 0 0 250px;
    list-style-type:none;
    overflow:hidden;
 }
#nav li {
    float:left;
    margin:0 1px;
 }
#nav a {
    display:block;
    line-height:22px;
    padding:0 4px;
    font-family:verdana,sans-serif;
    font-size:12px;
    background-color:#0b3c77;
    text-decoration:none; 
    color:#d8d7d2;
 }
#nav a:hover {
    color:#9aa4bf;
 }
#preamble {
    width:480px;
   
    margin:46px 0 0 334px;
    text-align:justify;
   
 }
#preamble h3 {
    margin-top:18px;
    font-family:arial,sans-serif;
    font-size:18px;
    font-style:italic;
    color:#fff;
 } 
#preamble .p1 {
    margin-bottom:10px;
    line-height:16px;
    font-family:verdana,geneva,arial,helvetica,sans-serif;
    font-size:14px;
    font-style:italic;
    color:#000;
 }
#footer {
    position:absolute;
    width:900px;
    height:28px;
    padding-top:20px;
    bottom:0;
    left:0;
    background-image:url(../images/footer-bg.jpg);
    font-family:verdana,sans-serif;
    font-size:small;font-size:13px;
    font-weight:bold;
    text-align:center;
 }
#footer a {
    color:#0b3c77;
    text-decoration:none; 
 }
#footer a:hover {
    color:#00c;
    text-decoration:underline;
 }
HTML Code:
<!DOCTYPE html>
<html lang="en">
<head>

<meta charset="utf-8">

<title>Charisma Communications - Home</title>

<link rel="stylesheet" media="screen"  href="css/page.css">

</head>
<body>

<div id="container" >

 <h1 class="header">Charisma Communications</h1>
 <h3 class="header">"...Moving People Beyond Their Limitations..."</h3>

<ul id="nav">
 <li><a href="index.html">Home</a></li>
 <li><a href="bio.html">Biography</a></li>
 <li><a href="presentations.html">Presentations</a></li>
 <li><a href="testimonials.html">Testimonials</a></li>
 <li><a href="videos.html">Videos/Pictures</a></li>
 <li><a href="events.html">Plan An Event</a></li>
 <li><a href="http://toesinmotion.wordpress.com/">My Blog</a></li>
 <li><a href="contact.html">Contact</a></li>
</ul>

<div id="preamble">
<h3>Welcome</h3>
<p class="p1">
Louis Gaudry's goal is to illustrate to people that no matter what your 
circumstances are in life, you can overcome your personal challenges. 
He's a comedian, an educator, and storyteller. He will get you laughing, 
thinking, and feeling good about yourself! 
</p>
<p class="p1">&nbsp;</p>
<p class="p1">&nbsp;</p>
<p class="p1">&nbsp;</p>
<p class="p1">&nbsp;</p>
<p class="p1">&nbsp;</p>
<p class="p1">&nbsp;</p>
<p class="p1">&nbsp;</p>
<p class="p1">&nbsp;</p>
<p class="p1">&nbsp;</p>



</div>

<div id="footer">
Copyright &copy; 2013 Charisma Communications		       
<a href="http://www.cjwebconsulting.com/">Website Designed By CJ Web Consulting</a>
</div> 
    
</div><!-- end #container -->

</body>
</html>