vertical clickable pure html css menu dropdown

by Rajat Jha

HTML

<!DOCTYPE html>
<html lang="en" >
    <head>
        <meta charset="utf-8" />
        <title>menu</title>

        
        <link rel="stylesheet" href="menu4.css" type="text/css" media="screen">
    </head>
    <body>
        <div class="container">
            <ul id="nav">
                <li><a href="#"><!--<img src="images/t1.png" />-->Home</a></li>
                <li><a href="#" class="sub" tabindex="1">Clothes</a><img src="images/up.gif" alt="" />
                    <ul>
                        <li><a href="#">Footwear</a></li>
                        <li><a href="#">Men's Wear</a></li>
                        <li><a href="#">Women's Wear</a></li>
                        <li><a href="#">Kids Wear</a></li>
                        <li><a href="#">Kids Footwear</a></li>
                        <li><a href="#">Kids Footwear</a></li>
                        <li><a href="#">Kids Footwear</a></li>
                        <li><a href="#">Kids Footwear</a></li>
                        <li><a href="#">Kids Footwear</a></li>
                        <li><a href="#">Kids Footwear</a></li>
                        <li><a href="#">Kids Footwear</a></li>
                        <li><a href="#">Kids Footwear</a></li>
                        <li><a href="#">Kids Footwear</a></li>
                    </ul>
                </li>
                <li><a href="#" class="sub" tabindex="1">Gifts</a><img src="images/up.gif" alt="" />
                    <ul>
                        <li><a href="#">Glass</a></li>
                        <li><a href="#">Taj Mahal</a></li>
                        <li><a href="#">Senry</a></li>
                        <li><a href="#">Color Panting</a></li>
                        <li><a href="#">Toys</a></li>
                    </ul>
                </li>
                <li><a href="#" class="sub" tabindex="1">Service</a><img src="images/up.gif" alt="" />
                <ul>
                <li><a href="#">Online Support</a></li>
               ...

CSS

#nav {
    border:0px solid #3e4547;
    box-shadow:1px 1px 5px #000000;
    border-radius:7px;
    -moz-border-radius:7px;
    -webkit-border-radius:7px;
}
#nav, #nav ul {
    list-style:none;
    padding:0;
    width:200px;
}
#nav ul {
    position:relative;
    z-index:-1;
     
}
#nav li {
    position:relative;
    z-index:100;
    
}
#nav ul li {
    margin-top:-51px;
   border-radius: 5px;
    -moz-transition:  0.4s linear 0.4s;
    -ms-transition: 0.4s linear 0.4s;
    -o-transition: 0.4s linear 0.4s;
    -webkit-transition: 0.4s linear 0.4s;
    transition: 0.4s linear 0.4s;
}
#nav li a {
    border-radius: 5px;
    background-color:red;
    color:white;
    display:block;
    font-size:15px;
    font-weight:bold;
    line-height:51px;
    outline:0;
    padding-left:15px;
    text-decoration:none;
}
#nav li a.sub {
/* background:#d4d5d8 url("../images/down.gif") no-repeat;  */
}
#nav li a + img {
    cursor:pointer;
    display:none;
    height:51px;
    left:0;
    position:absolute;
    top:0;
    width:200px;
}
#nav li a img {
    border-width:0px;
    height:50px;
    line-height:50px;
    margin-right:8px;
    vertical-align:middle;
    width:24px;
}
#nav li a:hover {
    background-color:darkred;
}
#nav ul li a {
    background-color:lightgreen;
    border-bottom:1px solid black;
    color:white;
    font-size:15px;
    line-height:50px;
}
#nav ul li a:hover {
    background-color: blue;
    color:yellow;
}

#nav ul li a img {
    /*background: url("bulb.png") no-repeat; */
    border-width:0px;
    height:50px;
    line-height:50px;
    margin-right:5px;
    vertical-align:middle;
    width:16px;
}
#nav ul li:nth-child(odd) a img {
   /* background:url("../images/bulb2.png") no-repeat; */
}
#nav a.sub:focus {
    background:blue;
    outline:0;
}
#nav a:focus ~ ul li {
    margin-top:0;
    -moz-transition:  0.4s linear;
    -ms-transition: 0.4s linear;
    -o-transition: 0.4s linears;
    -webkit-transition: 0.4s linears;
    transition: 0.4s...