make submenu wider than main menu - html

Question

I have this submenu and I would like it so that when the dropdown menu is out it has a width of 100% and covers the whole page. At the moment if I change the width to 100% it just makes it the same width as the main menu.
This is my current HTML:
<header>
<div class="header">
<div class="nav">
<ul>
<li> Services
<ul class="sub"> <a href="services.html#branddesign">
<li><img class="imgcenter" src="images/Brand-Design-Circle-Blue.png" width="100px" />
<br>
Brand Design
</li></a>
<a href="services.html#brandonline">
<li><img class="imgcenter" src="images/Brand-Online-Circle-Blue.png" width="100px" />
<br>
Brand Online
</li></a>
<a href="services.html#brandmarketing">
<li><img class="imgcenter" src="images/Brand-Marketing-Circle-Blue.png" width="100px" />
<br>
Brand Marketing
</li></a>
<a href="services.html#brandmanagement">
<li><img class="imgcenter" src="images/Brand-Management-Circle-Blue.png" width="100px" />
<br>
Brand Management
</li></a>
</ul>
</li>
<li> Clients
</li>
<li> About
</li>
<li> Contact Us
</li>
</ul>
</div>
</div>
</div>
and this CSS:
.header {
position: fixed;
display: block;
float: left;
width: 100%;
height: auto;
background-color: #666;
z-index: 9999;
}
.nav {
position: static;
float: left;
width: 500px;
height: 50px;
margin: 10px 5px;
}
.nav a {
text-decoration: none;
color: #FFFFFF;
}
.nav ul > li:first-child {
padding-bottom: 25px;
}
.nav a:hover {
text-decoration: none;
color: #6db6e5;
}
.nav li {
font-family: "eras_demi_itcregular", Arial, Helvetica;
list-style: none;
float: left;
margin-right: 50px;
}
.nav li:hover a:hover {
padding-bottom: 5px;
border-bottom: 2px solid #6db6e5;
color: #6db6e5;
}
.nav ul li:hover > ul {
height:150px;
}
.nav ul {
list-style: none;
position: absolute;
display: inline-block;
margin-top: 23px;
}
.nav ul ul {
width: 494px;
background: #7d7c7c;
height: 0px;
overflow: hidden;
padding-left:0;
margin-left:0;
font-size: 12px;
text-align: center;
-webkit-transition:all .5s ease-in-out;
-moz-transition:all .5s ease-in-out;
-o-transition:all .5s ease-in-out;
transition:all .5s ease-in-out;
}
.nav ul ul li {
padding: 10px;
margin-left: -1px;
margin-right: 0;
height: 129px;
}
.nav ul ul li:last-child {
}
.nav ul ul li:hover {
background: #666;
}
.nav li li {
height:130px;
-webkit-transition:all .3s ease-in-out;
}
Can anyone please tell me how I can make it so that the submenu can be wider than the main menu?

Answer 1

Try adding this to your CSS:
nav ul ul {
width: 100vw;
left: 0;
}
Fiddle: http://jsfiddle.net/9QE58/1/embedded/result/
That should keep it at 100% of the viewport width no matter what the pixel width is.