Q:

Using center alignment in HTML for e-mail

I started writing html for e-mails using tables. Now, for first time I tried to write using divs, but this is causing a problem: I cannot center align everything I used to be able to center. 
Maby what I wrote is not correct, but this is only way that I find, to be able after writing to copy everything from browser to Gmail. 
Can someone to tell me how I can center align in this code? 
If someone can also tell me if there are better ways to write this code I would be happy to recieve criticism and helpful information.
P.S: I tried padding, positioning, margin, put height and width, but with these options in most results HALF of my bacground or my background is going off at all.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head>

 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 <title>Untitled Document</title>

 <style type="text/css">
div#Container {
width: 895px;
height: 525px;
position: absolute;
left: 9px;
top: 15px;
}

div#Room {
padding-left: 245px;
padding-top: 80px;
width: 625px;
}

#Room span {
font-family: Times New Roman, Times, serif;
font-weight: bold;
font-size: 23px;
color: #522405;
}

#D { padding-left: 70px;
}

#GD { padding-left: 103px;
}

#GPV { padding-left: 53px;
}

div#Content {
padding-left: 245px;
padding-top: 10px;
width: 625px;
}

#Right {
position: absolute;
left: 872px;
top: 222px;
}

img.Spacer {
margin-left: 10px;
}

div.content {
font-family: Arial, Helvetica, sans-serif;
color: black;
font-size: 17px;
font-weight: bold;
}

.BP {
vertical-align: text-top;
margin-top: 10px;
margin-left: 245px;
}

.table {
vertical-align: text-top;
font-family: Arial, Helvetica, sans-serif;
font-size: 20px;
text-align: center;
color: #002b55;
margin-left:245px;
}

.TD {
margin-left: 30px;
}

.adress {
    font-family: Times New Roman, Times, serif;
font-size: 10px;
text-align: center;
font-weight: bold;
color: #100073; 
}

.OOT {
font-family: Arial, Helvetica, sans-serif;
font-size: 13px;
font-weight: bold;
color: #100073;
text-align:center;
}

.res {
vertical-align: top;
padding-left: 25px;
}

</style>

</head>

<body>

<div>

<img style="position: relative;" src="http://i1300.photobucket.com/albums/ag93/dobriyan/E-mail%20-%20Ayara%20Kamala/BK_zpsa93ab347.png" alt="Background" />

</div>

<div id="Container">

<div id="Room" >

    <a href="http://bit.ly/XSyPG5" title="Deluxe" target="_blank" >

    <img src="http://i1300.photobucket.com/albums/ag93/dobriyan/E-mail%20-%20Ayara%20Kamala/D_zpsf4ea5de8.jpg" border="0px" alt="Deluxe" />

    </a>

    <a href="http://bit.ly/XSyPG5" title="Grand Deluxe" target="_blank" >

    <img class="Spacer" src="http://i1300.photobucket.com/albums/ag93/dobriyan/E-mail%20-%20Ayara%20Kamala/GD_zpse78278b7.jpg" border="0px" alt="Grand Deluxe" />

    </a>

    <a href="http://bit.ly/XSyPG5" title="Grand Pool Villa" target="_blank" >

    <img class="Spacer" src="http://i1300.photobucket.com/albums/ag93/dobriyan/E-mail%20-%20Ayara%20Kamala/GPV_zpsb381cd33.jpg" border="0px" alt="Grand Pool Villa" />

    </a>

    <br />

    <a href="http://bit.ly/XSyPG5" title="Deluxe" target="_blank" style="text-decoration: none;"><span id="D">Deluxe</span></a>
    <a href="http://bit.ly/XSyPG5" title="Grand Deluxe" target="_blank" style="text-decoration: none;"><span id="GD">Grand Deluxe</span></a> 
    <a href="http://bit.ly/XSyPG5" title="Grand Pool Villa" target="_blank" style="text-decoration: none;"><span id="GPV">Grand Pool Villa</span></a>
  </div>

  <div id="Content" class="content">Situated on a hill, Ayara Kamala offers a beautiful garden and ocean view rooms. The place of the hotel provides quiet, calm and romantic holiday away from all other hotels on Kamala Beach.
<br />
<br />

Big size of rooms, king size beds and impressive bathrooms, are making Ayara Kamala            perfect selection for couples who are looking for privacy and relaxing holiday.
 </div>

<table class="table" style="border-collapse: separate; border-spacing: 1px;" width="625" border="0">
 <tr>
  <td align="right" style="padding-left: 20px;" width="302"><a href="http://bit.ly/XSyPG5" title="Book Now !"><img src="http://i1300.photobucket.com/albums/ag93/dobriyan/E-mail%20-%20Ayara%20Kamala/BP_zps15c948a1.png" border="0px" alt="Best Rate"/></a></td>
 <td width="321" valign="top"><table class="TD" style="border-collapse: separate; border-spacing: 0px;" border="0px">
 <tr>
 <td height="30" class="res" align="center"><a href="http://bit.ly/XSyPG5" title="B2B Online Booking"><span>www.b2b.onlyonetour.com</span></a></td>
 </tr>
 <tr>
 <td class="res" height="30" align="center"><span>Tel : (66) 02 - 688 - 8883 </span>      </td>
</tr>
<tr>
<td class="res" height="30" align="center"><a href="mailto:rsvn@onlyonetour.com" title="E-mail Reservation"><span>rsvn@onlyonetour.com</span></a></td>
</tr></table>
</td>
</tr>
</table>

<div align="center" id="Right"><a style="text-decoration: none;" href="http://bit.ly/XSyPG5" title="Only One Tour &amp; Travel Group Co., Ltd." target="_blank"><img width="149px" height="90px" src="http://i1300.photobucket.com/albums/ag93/dobriyan/E-mail%20-%20Ayara%20Kamala/logoOOT_zps24c21653.png" border="0px" alt="Logo" /></a>
<a style="text-decoration: none;" href="http://bit.ly/XSyPG5" title="Only One Tour &amp; Travel Group Co., Ltd." target="_blank"><span class="OOT">Only One Tour &amp; Travel<br />Group Co., Ltd.</span></a><br /><br />
<a style="text-decoration: none;" href="http://on.fb.me/XXqq56" title="Only One Tour Facebook Page" target="_blank"> <img src="http://i1300.photobucket.com/albums/ag93/dobriyan/E-mail%20-%20Ayara%20Kamala/facebook-logo-png-format-i18_zps83b6a9aa.png" width="145px" height="50px" border="0px" alt="FB"/></a><br /><br />
 <span class="adress">2128/9-11 Charoenkung Rd.,</span><br />
 <span class="adress">Watprayakrai, Bangkorleam,</span><br />
 <span class="adress">10120 Bangkok, Thailand.</span><br />
<a class="adress"  href="http://bit.ly/XSyPG5" target="_blank">www.b2b.onlyonetour.com</a><br />
<a class="adress" href="http://on.fb.me/XXqq56" target="_blank">www.onlyonetour.com (offline)</a>
 </div>

</div>

</body> 

</html>

A:

Now add <div align="center"></div> only for newsletter 
as like this 
<div align="center">

<img style="position: relative;" src="http://i1300.photobucket.com/albums/ag93/dobriyan/E-mail%20-%20Ayara%20Kamala/BK_zpsa93ab347.png" alt="Background" />

</div>

<div id="Container" align="center">

// your code
</div>

