html - Unable to get menu to expand with expanding submenu -


i'm having difficult time getting expanding menu work. have need have menu has items has sub menu items. don't want sub menu items displayed. approach want use have , arrow (analogous + sign) left of menu items have sub menu items. want user able select arrow display sub menu items. arrow change direction (analogous - sign). issue not in getting arrow , sub menus show. issue in expanding upper level div show sub menu items. (see sample)

#navigation_slideout {   position: fixed;   top: 85px;   left: -370px;   -webkit-transition-duration: .5s;   -moz-transition-duration: .5s;   -o-transition-duration: .5s;   transition-duration: .5s;   -webkit-border-radius: 5px;   -moz-border-radius: 5px;   border-radius: 5px;   -webkit-box-shadow: 0 0 40px #222;   -moz-box-shadow: 0 0 40px #222;   box-shadow: 0 0 40px #222; } #navigation_slideout:hover {   left: -39px; } #navigation_slideout ul {   list-style: none; } #navigation_slideout ul li {   background: #548ebe;   width: 325px;   height: 30px;   text-align: left;   padding-top: 5px;   font-family: helveticaneue, helvetica neue, helvetica, arial, sans-serif;   font-size: 12pt;   color: white;   font-weight: bold; } #navigation_slideout ul li {   color: #000;   text-decoration: none;   font-weight: bold;   display: block;   background-color: #548ebe;   color: white; } #navigation_slideout ul li ul {   width: 285px; } #navigation_slideout ul li ul li {   width: 10px;   position: relative;   left: -41px; } #navigation_slideout ul li ul li {   background: #548ebe;   width: 326px;   height: 30px;   text-align: left;   padding-top: 5px;   font-family: helvetica, arial, sans-serif;   font-size: 12pt;   color: white;   font-weight: bold; } #menu {   -ms-transform: rotate(-90deg);   -webkit-transform: rotate(-90deg);   transform: rotate(-90deg);   font-family: helveticaneue, helvetica neue, helvetica, arial, sans-serif;   font-size: 14pt;   color: white;   font-weight: bold;   margin: 0px 0px 0px 0px;   right: 0px;   padding: 0px 0px 0px 0px } #menu {   font-size: 14pt;   color: white;   font-weight: bold;   text-decoration: none; } table.nospacing {   border-collapse: collapse;   border-spacing: 0;   table-layout: fixed; } table.nospacing th, td {   padding: 0; } .menu-col {   max-width: 30px; } .expanding25 label {   /*background-color: #aaafab;     border-radius: 5px;     color: white;     */   padding: 3px;   padding-left: 25px; } .expanding25 li {   margin: 2px 2px 2px 0;   padding: 5px; } .expanding25 li > ul {   left: -35px;   position: relative;   width: 100% } .expanding25 input[type=checkbox] {   display: none; } .expanding25 input[type=checkbox] ~ ul {   max-height: 0;   max-width: 0;   opacity: 0;   overflow: hidden;   white-space: nowrap;   -webkit-transition: 1s ease;   -moz-transition: 1s ease;   -o-transition: 1s ease;   transition: 1s ease; } .expanding25 input[type=checkbox]:checked ~ ul {   max-height: 100%;   max-width: 100%;   opacity: 1; } .expanding25 input[type=checkbox] + label:before {   transform-origin: 25% 50%;   border: 8px solid transparent;   border-width: 8px 12px;   border-left-color: white;   margin-left: -20px;   width: 0;   height: 0;   display: inline-block;   text-align: center;   content: '';   color: #aaafab;   -webkit-transition: .5s ease;   -moz-transition: .5s ease;   -o-transition: .5s ease;   transition: .5s ease;   position: absolute;   margin-top: 1px; } .expanding25 input[type=checkbox]:checked + label:before {   transform: rotate(90deg);   /*margin-top: 6px;   margin-left: -25px;*/ } 
<div id="navigation_slideout" style="background-color:#548ebe;z-index:1" onclick="">   <table class="nospacing" style="border-style:none">     <tr>       <td>         <ul>           <li>&nbsp;&nbsp;&nbsp;title</li>           <li><a href="#">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;home</a>           </li>           <li><a href="#">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;about</a>           </li>           <li><a href="#">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;contacts</a>           </li>           <li><a href="#">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;faqs</a>           </li>           <li class="expanding25">             <input class="expanding25" type="checkbox" id="cb28" />             <label class="expanding25" for="cb28">topic areas</label>             <ul class="expanding25">               <li class="expanding25">                 <label class="expanding25">topic 1</label>content</li>               <li class="expanding25">                 <label class="expanding25">topic 2</label>content</li>               <li class="expanding25">                 <label class="expanding25">topic 3</label>content</li>               <li class="expanding25">                 <label class="expanding25">topic 4</label>content</li>             </ul>           </li>          </ul>       </td>       <td class="menu-col" style="border-left:medium;border-left-color:white;border-left-style:solid">         <p id="menu">menu</p>       </td>      </tr>   </table>  </div>

all #navigation_slideout ul li getting height: 30px, submenu inside li can’t grow tall enough show it. adding style fix it:

#navigation_slideout ul li.expanding25 { height: auto }

sample.


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