<html>
<head>
<link rel="stylesheet" href="css/template.css"/>
</head>
<body>
<div id="maindiv">

    <div id="top_bar">
    <div id="logo"><img src="img/avatar2.png" width="32px" height="32px"></div>
    <div id="settings"><img src="img/avatar2.png" width="32px" height="32px"></div>
    </div><!---topbar--->

            <div id="container">
                <div id="leftpanel">
                <table border="1px" align="center" class="edit">
                <tr>
                <td> Edit </td>
                <td> view </td>
                <td> Delete </td>
                </tr>
                </table>
                <table border="1px" align="center" class="leftmenu">
                <tr><td>tab1</td></tr>
                <tr><td>tab2</td></tr>
                <tr><td>tab3</td></tr>
                </table>
                </div>

            <div id="rightpanel">
            <table>
            <tr><td>Bag</td></tr>
            <tr><td>Mobile</td></tr>
            <tr><td>Smart Phone</td></tr>
            <tr><td>Laptop</td></tr>
            <tr><td>Bike</td></tr>
            <tr><td>Gold</td></tr>
            <tr><td>Alto Car</td></tr>
            <tr><td>Swift Car</td></tr>
            <tr><td>Vernam Car</td></tr>
            <tr><td>Ford ecosport Car</td></tr>
            <tr><td>Innova Car</td></tr>
            <tr><td>Duplex Car</td></tr>
            <tr><td>Retirement</td></tr>

            </table>
            </div>


            </div><!---container-->
            </div><!-----maindiv--->




            </body>
            </html>

Just posting your HTML doesn't provide enough info as to what the problem is.

Is the style sheet accessible online or could you post the relevant styles.