OK, First of all after spending much more time I got the solution but I want to know the reason. Whether it is browser bug or I am making some mistake.
Please find following entire code which render this page incorrectly in Google Chrome, Opera and other few browsers. This code work correctly in FireFox. I can't give jsfiddle link as this problem is not getting reproduced in that environment.
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
<style>
#middlecontainer{width:1000px; height:auto; background-color:#fcf6e2; float:left;}
.matterbox{width:750px; height:auto; float:left;}
.rightsidebox{width:250px; height:auto; float:right; }
.matter{padding:15px; padding-top:10px;
.heading{ padding:8px; padding-left:5px; font-weight:bold; background-color:#f5d7a7;}
.subheading{font-size:15px; padding-top:5px; color:#663300; font-weight:bold;}
</style>
</head>
<body>
<div id="middlecontainer">
<img src="http://placehold.it/1000x150" align="top"/>
<div class="matterbox">
<div class="matter">
<div class="heading">Welcome to product registration</div>
<p class="style1">Important </p>
</div>
</div>
<div class="rightsidebox">
<div class="matter">
<p> This is right hand column </p>
</div>
<div style="clear:both"></div>
</div>
</div>
</body>
</html>
If you are able to reproduce this code (middlecontainer div becomes invisible) in Chrome or in Opera then you can add style="float:left" inline to img tag. This solves this problem but I am trying to find out reason of this problem.
Most importantly FireFox renders this page correctly without any problem.
Please let me know if I need to upload this code on some online web server.
I have uploaded web page on this Link
This is because the browser automatically renders the website to the default zoom unless you state otherwise. You should use a meta tag to declare the zoom for the webpage. Check out https://developer.mozilla.org/en/docs/Mozilla/Mobile/Viewport_meta_tag. If you need more help or this isn't what your looking for please comment back.
Sent from mobile.