Hide css dropdown menu - html

Question

I've created a dropdown menu in css. My problem is that the dropdown is fixed on mobile phone if i touch somewhere outside the menu. How can i hide my dropdown menu on mobile phone? On desktop with mouse it works fine.
here is my css:
#nav {
margin: 0;
text-align:center;
position:fixed;
width:1162px;
top: 0%;
left: 50%;
margin-left: -587px; /* Die Hälfte der Breite (width) + 6px */
padding: 7px 6px 0;
background: #7d7d7d url(img/gradient.png) repeat-x 0 -110px;
line-height: 100%;
border-radius: 1em;
-webkit-border-radius: 1em;
-moz-border-radius: 1em;
-webkit-box-shadow: 0 1px 3px rgba(0,0,0, .4);
-moz-box-shadow: 0 1px 3px rgba(0,0,0, .4);
}
#nav li {
margin: 0 5px;
padding: 0 0 8px;
float: left;
position: relative;
list-style: none;
}
/* main level link */
#nav a {
font-weight: bold;
color: #e7e5e5;
text-decoration: none;
display: block;
padding: 8px 20px;
margin: 0;
-webkit-border-radius: 1.6em;
-moz-border-radius: 1.6em;
text-shadow: 0 1px 1px rgba(0,0,0, .3);
}
#nav a:hover {
background: #000;
color: #fff;
}
/* main level link hover */
#nav .current a, #nav li:hover > a {
background: #666 url(img/gradient.png) repeat-x 0 -40px;
color: #444;
border-top: solid 1px #f8f8f8;
-webkit-box-shadow: 0 1px 1px rgba(0,0,0, .2);
-moz-box-shadow: 0 1px 1px rgba(0,0,0, .2);
box-shadow: 0 1px 1px rgba(0,0,0, .2);
text-shadow: 0 1px 0 rgba(255,255,255, 1);
}
/* sub levels link hover */
#nav ul li:hover a, #nav li:hover li a {
background: none;
border: none;
color: #666;
-webkit-box-shadow: none;
-moz-box-shadow: none;
}
#nav ul a:hover {
background: #0078ff url(img/gradient.png) repeat-x 0 -100px !important;
color: #fff !important;
-webkit-border-radius: 0;
-moz-border-radius: 0;
text-shadow: 0 1px 1px rgba(0,0,0, .1);
}
/* dropdown */
#nav li:hover > ul {
display: block;
}
/* level 2 list */
#nav ul {
display: none;
margin: 0;
padding: 0;
width: 185px;
position: absolute;
top: 35px;
left: 0;
background: #ddd url(img/gradient.png) repeat-x 0 0;
border: solid 1px #b4b4b4;
-webkit-border-radius: 10px;
-moz-border-radius: 10px;
border-radius: 10px;
-webkit-box-shadow: 0 1px 3px rgba(0,0,0, .3);
-moz-box-shadow: 0 1px 3px rgba(0,0,0, .3);
box-shadow: 0 1px 3px rgba(0,0,0, .3);
}
#nav ul li {
float: none;
margin: 0;
padding: 0;
}
#nav ul a {
font-weight: normal;
text-shadow: 0 1px 0 #fff;
}
/* level 3+ list */
#nav ul ul {
left: 185px;
top: -1px;
}
/* rounded corners of first and last link */
#nav ul li:first-child > a {
-webkit-border-top-left-radius: 9px;
-moz-border-radius-topleft: 9px;
-webkit-border-top-right-radius: 9px;
-moz-border-radius-topright: 9px;
}
#nav ul li:last-child > a {
-webkit-border-bottom-left-radius: 9px;
-moz-border-radius-bottomleft: 9px;
-webkit-border-bottom-right-radius: 9px;
-moz-border-radius-bottomright: 9px;
}
/* clearfix */
#nav:after {
content: ".";
display: block;
clear: both;
visibility: hidden;
line-height: 0;
height: 0;
}
#nav {
display: inline-block;
}
html[xmlns] #nav {
display: block;
}
* html #nav {
height: 1%;
}
and here the navigation menu set with ul and li
<ul id="nav">
<li class="current">Test</li>
<li>Musik
<ul>
<li>Test</li>
<li>Test
<ul>
<li>Test</li>
</ul>
</li>
</ul>
</li>
</ul>

Answer 1

ul { display:block; padding:0px;}
ul li{ display: inline-block; position:relative;}
ul li ul { display:none; position:absolute; top:100%; left:0;}
ul li ul li { display:block;}
ul li ul li ul { left:100%; top:0;}
ul li:hover > ul { display:block; width:120px;}
<ul>
<li>
Menu option
</li>
<li>
Menu option2
<ul>
<li>
Submenu 1
<ul>
<li>
Submenu 2
</li>
</ul>
</li>
<li>
Submenu
</li>
<li>
Submenu
</li>
</ul>
</li>
</ul>
If you are using hover property to show drop-down menu on desktop then it's automatically hidden on mobile when you touch outside the menu