怎么用html做一个三级菜单栏,只使用H5和CSS3制作带有二三级菜单的导航栏，下面代码怎么改？...

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body

{

margin:0;

padding:0;

width:100%;

height:100%;

background:#47c9af;;

color:#74777b;

font-weight:500;

font-size:1em;

font-family:'Raleway', Arial, sans-serif;

}

a:link,a:visited{text-decoration:none;list-style:none;}

*, *:after, *:before

{

-webkit-box-sizing: border-box;

-moz-box-sizing: border-box;

-o-box-sizing: border-box;

box-sizing: border-box;

}

/*---------------------------------------*/

div

{

width: 1000px;

height: 1000px;

margin: 20px auto;

}

nav ul li

{

width: 90px;

height: 40px;

list-style:none;

float: left;

margin: 5px 5px 0px 5px;

background-color: #f08080;

text-align: center;

}

.menu1

{

background-color: #FF00FF;

}

.menu3

{

background-color: #00FFFF;

}

.menu3 ul li

{

clear: both;

width: 90px;

height: 40px;

background-color: #e9967a;

position: relative;

left: -45px;

visibility: hidden;

}

.menu3:hover ul li

{

visibility: visible;

color: #fff;

}

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