<nav class="main-header navbar navbar-expand-md navbar-light navbar-white">
  <div class="container">
    <span class="navbar-brand mb-0 h1 brand-text font-weight-light"></span>
    <a href="<?php echo site_url() ?>/General/show_general_home" class="navbar-brand mb-0 h1 brand-text font-weight-light"><img src="<?php echo base_url() ?>image/logo.png" alt="Logo online exhibition" height="35px"></a>
    </a>
    <div class="collapse navbar-collapse order-3" id="navbarCollapse">
      <ul class="navbar-nav ml-auto">
        <li class="nav-item">
          <a class="nav-link " href="<?php echo site_url() . '/Login/show_login' ?>" aria-expanded="true"><?php echo 'เข้าสู่ระบบ' ?></a>
        </li>
      </ul>
    </div>
</nav>