html - CSS Bootstrap MegaMenu -

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i'm trying make megamenu dropdown, bugs.

problems:

-the li tags inside sub-menu not appearing.

-mouse hover on sub-menu , main menu border disappear.

images

mouse hover main menu: enter image description here

mouse hover sub-menu: enter image description here

html:

    <div class="collapse navbar-collapse" id="mainmenu">   <!-- main navigation -->   <ul class="nav navbar-nav pull-right">     <li class="primary <?php if($page == 'main'){ echo 'active'; } ?>">       <a href="./?page=main" class="firstlevel last" >home</a>     </li>     <li class="primary <?php if($page == 'about'){ echo 'active'; } ?>">       <a href="./?page=about" class="firstlevel last" >about us</a>                      </li>     <li class="primary">       <a href="#" class="drop">features</a><!-- begin 4 columns item -->       <div class="dropdown_4columns align_right"><!-- begin 4 columns container -->         <div class="col-md-4">           <h3>technical</h3>           <ul>             <li><a href="#">themeforest</a></li>             <li><a href="#">graphicriver</a></li>             <li><a href="#">activeden</a></li>             <li><a href="#">videohive</a></li>             <li><a href="#">3docean</a></li>           </ul>             </div>          <div class="col-md-4">            <h3>design</h3>           <ul>             <li><a href="#">nettuts</a></li>             <li><a href="#">vectortuts</a></li>             <li><a href="#">psdtuts</a></li>             <li><a href="#">phototuts</a></li>             <li><a href="#">activetuts</a></li>           </ul>             </div>          <div class="col-md-4">            <h3>software</h3>           <ul>             <li><a href="#">freelanceswitch</a></li>             <li><a href="#">creattica</a></li>             <li><a href="#">workawesome</a></li>             <li><a href="#">mac apps</a></li>             <li><a href="#">web apps</a></li>           </ul>             </div>                </div><!-- end 4 columns container -->     </li>     <li class="primary <?php if($page == 'portfolio'){ echo 'active'; } ?>"><a href="./?page=portfolio" class="firstlevel last">portfolio</a></li>     <li class="primary <?php if($page == ''){ echo 'active'; } ?>"><a href="" class="firstlevel last">downloads</a></li>   </ul>   <!-- end main navigation --> </div>

css

#mainmenu .navbar-nav li{  	border-bottom:1px solid #555;  }  #mainmenu .navbar-nav li:last-child,  #mainmenu .navbar-nav li:last-child a{  	border-bottom:none !important;  }    #mainmenu li:hover {      background:none;      border:none;      padding:0;      margin:0;  }     #mainmenu li {      display:block;      outline:0;      text-decoration:none;  }     #mainmenu li:hover {      color:#161616;      text-shadow: 1px 1px 1px #ffffff;  }       /* drop down */      .dropdown_4columns{      float:left;      position:absolute;      display:none; /* hides drop down */      text-align:left;      border-top:none;      background-color:#eee;  }     .dropdown_4columns {width: 560px;}     #mainmenu li:hover .dropdown_4columns{      display:block;      top:auto;    }    #mainmenu li:hover .align_right {      left:auto;      right:-1px;      top:auto;  }     /* drop down content stylings */     #mainmenu p, #mainmenu h2, #mainmenu h3, #mainmenu ul li {      line-height:21px;      font-size:12px;      text-align:left;  }  #mainmenu h2 {      font-size:21px;      font-weight:400;      letter-spacing:-1px;      margin:7px 0 14px 0;      padding-bottom:14px;      border-bottom:1px solid #666666;  }  #mainmenu h3 {      font-size:14px;      margin:7px 0 14px 0;      padding-bottom:7px;      border-bottom:1px solid #888888;  }  #mainmenu p {      line-height:18px;      margin:0 0 10px 0;  }     #mainmenu li:hover div {      font-size:12px;      color:#015b86;  }  #mainmenu li:hover div a:hover {      color:#029feb;  }    #mainmenu li ul {      list-style:none;      padding:0;      margin:0 0 0px 0;  }  #mainmenu li ul li {      position:relative;      padding:0;      margin:0;      float:none;      text-align:left;  	display:block;  }  #mainmenu li ul li:hover {      background:none;      padding:0;      margin:0;  }    .navbar-default .navbar-nav > .active > a,  .navbar-default .navbar-nav>li>a:hover,  .navbar-default .navbar-nav>li>a:focus,  .navbar-default .navbar-nav > .active > a:hover,  .navbar-default .navbar-nav > .active > a:focus{  	background:none;  	border-bottom:3px solid #984793;  	color:#984793;  }

the problem css:

#mainmenu .navbar-nav li:last-child, #mainmenu .navbar-nav li:last-child a{     border-bottom:none !important; /* removes bottom border last-child */ }

if remove works expected

here's fiddle showing fix


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