CSS stretch horizontal menu to fill all width - html

Question

Here is the link to my site. When you have a wide resolution there is no issue with the dispaly, but if with the brower I try to simulate a little resolution, I come across an issue :
The nav bar won't fill the entire page but only the width of the browser, even though I used width : 100%;
Here the code in CSS
header {
width: 100%;
/*min-width: 1000px;*/
-webkit-box-shadow: 0px 1px 1px 0px rgba(250, 250, 250, .5);
-moz-box-shadow: 0px 1px 1px 0px rgba(250, 250, 250, .5);
box-shadow: 0px 1px 1px 0px rgba(250, 250, 250, .5);
padding-top: 60px; /* Gere l'espace entre le top et la barre de menu */
background: url('../img/binding_dark.png');
}
nav {
margin-bottom: 30px;
width: 100%;
background: -moz-linear-gradient(top, #353535 0%, #222222 100%);
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#353535), color-stop(100%,#222222));
background: -webkit-linear-gradient(top, #353535 0%,#222222 100%);
background: -o-linear-gradient(top, #353535 0%,#222222 100%);
background: -ms-linear-gradient(top, #353535 0%,#222222 100%);
background: linear-gradient(top, #353535 0%,#222222 100%);
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#353535', endColorstr='#222222',GradientType=0 );
border-width: 1px 0 1px 0;
border-style: solid;
border-color: #000;
}
The header is the wide black block and the nav is inside it.
Here is an exemple of the issue:
The header won't fill all the page (horizontally), the li element would overflow, and gradient background would split.
Is there a solution to this please ?

Answer 1

Here is your corrected css and fiddle link
header {
width: 100%;
-webkit-box-shadow: 0px 1px 1px 0px rgba(250, 250, 250, .5);
-moz-box-shadow: 0px 1px 1px 0px rgba(250, 250, 250, .5);
box-shadow: 0px 1px 1px 0px rgba(250, 250, 250, .5);
padding-top: 60px; /* Gere l'espace entre le top et la barre de menu */
background: url('../img/binding_dark.png');
}
hgroup,
main,
nav {
margin-bottom: 30px;
width: 100%;
background: -moz-linear-gradient(top, #353535 0%, #222222 100%);
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#353535), color-stop(100%,#222222));
background: -webkit-linear-gradient(top, #353535 0%,#222222 100%);
background: -o-linear-gradient(top, #353535 0%,#222222 100%);
background: -ms-linear-gradient(top, #353535 0%,#222222 100%);
background: linear-gradient(top, #353535 0%,#222222 100%);
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#353535', endColorstr='#222222',GradientType=0 );
border-top:1px solid #000;
border-bottom:1px solid #000;
}
/* nav:before {
border-top: 1px solid #444;
}
nav:after {
border-top: 1px solid #333;
}*/
nav ul {
/*width: 808px;*/
height: 45px;
margin: 0 auto;
/*border-left: 1px solid #111;
border-right: 1px solid #444;*/
}
nav li {
float: left;
list-style-type:none;
}
nav li a {
display: inline-block;
/*width: 200px;*/
width:auto;
padding:0 50px;
height: 45px;
font: bold 15px 'Arial', sans-serif;
color: #fff;
text-decoration: none;
text-align: center;
line-height: 48px;
text-shadow: 1px 1px 0px #111;
filter: dropshadow(color=#111, offx=1, offy=1);
border-left: 1px solid #444;
border-right: 1px solid #111;
background-color:#2B2B2B;
}
nav li a:hover {
background: -moz-linear-gradient(top, #444 0%, #222 100%);
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#444), color-stop(100%,#222));
background: -webkit-linear-gradient(top, #444 0%,#222 100%);
background: -o-linear-gradient(top, #444 0%,#222 100%);
background: -ms-linear-gradient(top, #444 0%,#222 100%);
background: linear-gradient(top, #444 0%,#222 100%);
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#444', endColorstr='#222',GradientType=0 );
/*background-color:#2F2F2F;*/
}
nav li a:active {
background: #222;
-webkit-box-shadow: inset 0px 0px 3px 1px rgba(0, 0, 0, .3);
-moz-box-shadow: inset 0px 0px 3px 1px rgba(0, 0, 0, .3);
box-shadow: inset 0px 0px 3px 1px rgba(0, 0, 0, .3);
}
nav li a:active:after {
content: "";
display: block;
width: 100%;
height: 4px;
position: relative;
bottom: 6px;
background: -moz-linear-gradient(top, #ff5e1f 0%, #ff3410 100%);
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#ff5e1f), color-stop(100%,#ff3410));
background: -webkit-linear-gradient(top, #ff5e1f 0%,#ff3410 100%);
background: -o-linear-gradient(top, #ff5e1f 0%,#ff3410 100%);
background: -ms-linear-gradient(top, #ff5e1f 0%,#ff3410 100%);
background: linear-gradient(top, #ff5e1f 0%,#ff3410 100%);
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#ff5e1f', endColorstr='#ff3410',GradientType=0 );
}

Answer 2

There are other issues with the layout, but for the immediate problem, you could try
#page-wrap header {min-width: 1400px;}

Answer 3

Try increasing the width of the nav ul.
nav ul {
width: 809px;
height: 45px;
margin: 0 auto;
border-left: 1px solid #111;
border-right: 1px solid #444;
}
You can use Developer Tools(F12) to inspect elements.
Check this .