div class="sidebar-left" style="width: 1000px;"> //assuming I want the div to be increased by 1000 pixel
    <div class="sidebar-scroll">
        <div class="sidebar-header left-sidebar-header">
            <h3 onclick="home_page()" ><img src="<?php echo base_url();?>images/framework/logo.png" alt="logo"  /> </h3>
.........
</div></div></div>