html - Need help making a sub menu that opens on hover -

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i have menu have built working fine, trying add sub menu items appear when mouse hovers on menu item. know how this? 

<div id="menu">             <a  href="#" >home</a>             <a  href="#">submit new record</a>             <a   href="#">sales salesperson</a>             <a   href="#">total sales</a>             <a  href="#" >sales issue</a>             <a  href="#" >sales ad size</a>              <a  href="#" >add new user</a>               <a href="#">edit record</a>              <a href="#">logout</a>             </div></center> <style> #menu{ background-color:#3f9ad1; height:75px; width:1206px; }  #menu a{ border-style:solid; border-width:2px; border-color:white; padding-top: 20px; float:left; display:block; width:130px; height:70px; text-decoration:none; color:white; text-align:center; font-family: arial; /*box-shadow: 0 -7px 22px 6px #000000 inset;*/ }  #menu a:hover{     color:#3f9ad1;     background-color:white;  #html {  height: 100%;  margin-bottom: 0.01em; overflow-y: scroll; }  </style>

i this:

<ul class="menu">     <li>main menu item         <ul class="submenu">             <li>sub menu item</li>         </ul>     </li> </ul>

then css this:

ul.submenu {     display: none; }  li:hover ul.submenu {     display: block; }

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