<aside>
    <div id="sidebar" class="nav-collapse ">
        <ul class="sidebar-menu">
            <li class="active">
                <a class="" href="dashboard.php">
                    <i class="icon_house_alt"></i>
                    <span>Dashboard</span>
                </a>
            </li>
            <li class="sub-menu">
                <a href="javascript:;" class="">
                    <i class="icon_documents_alt"></i>
                    <span>Creation</span>
                    <span class="menu-arrow arrow_carrot-right"></span>
                </a>
                <ul class="sub">
                <li><a class="" href="course.php">course</a></li>
                <li><a class="" href="teacher.php">teacher</a></li>
                <li><a class="" href="student.php">student</a></li>
                <li><a class="" href="section.php">section</a></li>
                <li><a class="" href="session.php">session</a></li>
                </ul>
            </li>
            <li class="sub-menu">
                <a href="javascript:;" class="">
                    <i class="icon_documents_alt"></i>
                    <span>Manage</span>
                    <span class="menu-arrow arrow_carrot-right"></span>
                </a>
                <ul class="sub">
                <li><a class="" href="manage_sessions.php">Sessions</a></li>
                <li><a class="" href="manage_enrollment_status.php">Enrollment status</a></li>
                <li><a class="" href="manage_student_enrollment.php">Student Enrollment</a></li>
            </ul>
            </li>
            <li>
                <a class="" href="teacher_assign.php">
                    <i class="icon_document_alt"></i>
                    <span>Teacher Assign</span>
                </a>
            </li>
            <li class="sub-menu">
                <a href="javascript:;" class="">
                    <i class="icon_desktop"></i>
                    <span>Preview</span>
                    <span class="menu-arrow arrow_carrot-right"></span>
                </a>
                <ul class="sub">
                <li><a class="" href="course-table.php">All courses</a></li>
                <li><a class="" href="teacher-table.php">All teachers</a></li>
                </ul>
            </li>
            <li class="sub-menu">
                <a href="javascript:;" class="">
                    <i class="icon_documents_alt"></i>
                    <span>Tables</span>
                    <span class="menu-arrow arrow_carrot-right"></span>
                </a>
                <ul class="sub">
                <li><a class="" href="table_teacher.php">Teacher</a></li>
                <li><a class="" href="table_student.php">Student</a></li>
                <li><a class="" href="table_course.php">Course</a></li>
                <li><a class="" href="table_section.php">Section</a></li>
            </ul>
            </li>
        </ul>
    </div>
</aside>