JSFiddle - React, Tailwind, and code Playground

HTML

<div id="wrapper_menu">
    <div id="menuicon">
        <div class="menubar" id="menubar-top"></div>
        <div class="menubar" id="menubar-mid"></div>
        <div class="menubar" id="menubar-bottom"></div>
    </div>
    <nav id="menu">
        <div id="pnlMenu">	<a class="menu_link1" href="Index.aspx?category=1">menu1</a><a class="menu_link2" href="Index.aspx?category=2">menu2</a><a class="menu_link3" href="Index.aspx?category=4">menu3</a><a class="menu_link4" href="Index.aspx?category=5">menu4</a><a class="menu_link5" href="Index.aspx?category=6">menu5</a><a class="menu_link6 last_menu_link" href="Index.aspx?category=8">menu6</a>

        </div>
        <div id="pnlSubmenu" style="display:none">
            <div class="submenu_panel" style="height:100px">	<a class="submenu_link" href="Pages/Chart.aspx?id=7">submenu1</a><a class="submenu_link" href="Pages/Chart.aspx?id=8">submenu2</a>

            </div>
            <div class="submenu_panel" style="height:100px"> <a class="submenu_link" href="Pages/Chart.aspx?id=4">Link1</a>
 <a class="submenu_link" href="Pages/Chart.aspx?id=11">Link2</a>

            </div>
        </div>
    </nav>
</div>

CSS

#pnlMenu .menu_link:hover #pnlSubmenu .submenu_link {
    height:50px;
    display:block;
}
#wrapper_menu {
    margin-bottom: 50px;
    position: relative;
    z-index: 1;
}
#menuicon {
    margin: 0 auto;
    width: 27px;
    display: none;
}
.menubar {
    background: #001155;
    height: 4px;
    width: 27px;
    margin-bottom: 5px;
    border-radius: 2px;
    position: relative;
    -webkit-transition: all 0.3s ease-out;
    -moz-transition: all 0.3s ease-out;
    -ms-transition: all 0.3s ease-out;
    -o-transition: all 0.3s ease-out;
    transition: all 0.3s ease-out;
}
#menuicon:hover #menubar-top {
    transform: translate(0px, 9px) rotate(45deg);
}
#menuicon:hover #menubar-mid {
    opacity: 0;
}
#menuicon:hover #menubar-bottom {
    transform: translate(0px, -9px) rotate(-45deg);
}
#menu {
    height: 44px;
    width: 980px;
    margin: 0 auto;
    border-radius: 5px;
    background: rgb(229, 229, 229);
    /* Old browsers */
    background: -moz-linear-gradient(top, rgba(229, 229, 229, 0.95) 0%, rgba(193, 192, 194, 0.95) 100%);
    /* FF3.6+ */
    background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, rgba(229, 229, 229, 0.95)), color-stop(100%, rgba(193, 192, 194, 0.95)));
    /* Chrome,Safari4+ */
    background: -webkit-linear-gradient(top, rgba(229, 229, 229, 0.95) 0%, rgba(193, 192, 194, 0.95) 100%);
    /* Chrome10+,Safari5.1+ */
    background: -o-linear-gradient(top, rgba(229, 229, 229, 0.95) 0%, rgba(193, 192, 194, 0.95) 100%);
    /* Opera 11.10+ */
    background: -ms-linear-gradient(top, rgba(229, 229, 229, 0.95) 0%, rgba(193, 192, 194, 0.95) 100%);
    /* IE10+ */
    background: linear-gradient(to bottom, rgba(229, 229, 229, 0.95) 0%, rgba(193, 192, 194, 0.95) 100%);
    /* W3C */
    filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#e5e5e5', endColorstr='#c1c0c2', GradientType=0);
    /* IE6-9 */
    -webkit-box-shadow: 0px 2px 2px 0px rgba(50, 50, 50, 0.5);
    -moz-box-shadow: 0px 2px 2px 0px...

JavaScript

$(document).ready(function () {
     $('.menu_link').ready(function () {
         $("[id$=pnlSubmenu]").hide();
     });
     $('.menu_link1').hover(function () {
         $("[id$=pnlSubmenu]").slideDown(200);
         $("[class$=submenu_panel]").css("left", "0px");
     });
     $('.menu_link2').hover(function () {
         $("[id$=pnlSubmenu]").slideDown(200);
         $("[class$=submenu_panel]").css("left", "12%");
         
     });
     $('.menu_link3').hover(function () {
         $("[id$=pnlSubmenu]").slideDown(200);
         $("[class$=submenu_panel]").css("left", "25%");
     });
     $('.menu_link4').hover(function () {
         $("[id$=pnlSubmenu]").slideDown(200);
        $("[class$=submenu_panel]").css("left", "37%");
     });
     $('.menu_link5').hover(function () {
         $("[id$=pnlSubmenu]").slideDown(200);
         $("[class$=submenu_panel]").css("left", "50%");
     });
     $('[id$=pnlSubmenu]').mouseenter(function () {
         $(this).show();
     });
     $('[id$=pnlSubmenu]').mouseleave(function () {
         $(this).hide();
     });
     $('.menu_link1').mouseleave(function () {
         $("[id$=pnlSubmenu]").hide();
     });
      $('.menu_link2').mouseleave(function () {
         $("[id$=pnlSubmenu]").hide();
     });
      $('.menu_link3').mouseleave(function () {
         $("[id$=pnlSubmenu]").hide();
     });
      $('.menu_link4').mouseleave(function () {
         $("[id$=pnlSubmenu]").hide();
     });
      $('.menu_link5').mouseleave(function () {
         $("[id$=pnlSubmenu]").hide();
     });
     });