I want to make a drop-down menu, but I don't know how to do it. Can you help me?_html/css

I want to make a drop-down menu, but I don't know how to do it. Can you help me?_html/css_WEB-ITnose

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Release： 2016-06-24 12:08:36

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I want the "Front Desk" and "Front Desk Cashier" level li to be arranged horizontally, and the "Reservation Management" and "Reception Management" level li to be arranged vertically. What should I do?
Is it right to put the ul of the submenu under the li of the previous level?

Hotel management System
< ;script type="text/javascript">
function showmenu(topnavid)
{
var menuid=topnavid "_hidlist";
var menu=document.getElementById(menuid);
menu.style.display=menu.style.display=="block"?"none":"block";
}

< body style="position: relative;min-height: 100%; top:0px; background: url('img1.png') repeat-x; color:#000000;margin:0px">

Logout

Front Desk

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我想做个下拉菜单，不知道怎么做，能帮我看看吗

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I want to make a drop-down menu, but I don't know how to do it. Can you help me?_html/css_WEB-ITnose

li li { float:none; display:block; }