CSS: Full width of drop down men - css

Question

I found below menu online and I like it, I want to change its width to 1400px. I tried to edit its CSS to match my header width for but I couldn't succeed.
Before I edit it
After I edit it
CSS Code
.nav,
.nav a,
.nav ul,
.nav li,
.nav div,
.nav form,
.nav input {
margin: 0;
padding: 0;
border: none;
outline: none;
width:100%; // What I have changed only
}
.nav a { text-decoration: none; }
.nav li { list-style: none; }
/* Menu Container */
.nav {
display: inline-block;
position: relative;
cursor: default;
z-index: 500;
}
/* Menu List */
.nav > li {
display: block;
float: left;
}
/* Menu Links */
.nav > li > a {
position: relative;
display: block;
z-index: 510;
height: 54px;
padding: 0 20px;
line-height: 54px;
font-family: Helvetica, Arial, sans-serif;
font-weight: bold;
font-size: 13px;
color: #fcfcfc;
text-shadow: 0 0 1px rgba(0,0,0,.35);
background: #771203;
border-left: 1px solid #4b4441;
border-right: 1px solid #312a27;
-webkit-transition: all .3s ease;
-moz-transition: all .3s ease;
-o-transition: all .3s ease;
-ms-transition: all .3s ease;
transition: all .3s ease;
}
.nav > li:hover > a { background: #4b4441; }
.nav > li:first-child > a {
border-radius: 3px 0 0 3px;
border-left: none;
}
/* Search Form */
.nav > li.nav-search > form {
position: relative;
width: inherit;
height: 54px;
z-index: 510;
border-left: 1px solid #4b4441;
}
.nav > li.nav-search input[type="text"] {
display: block;
float: left;
width: 1px;
height: 24px;
padding: 15px 0;
line-height: 24px;
font-family: Helvetica, Arial, sans-serif;
font-weight: bold;
font-size: 13px;
color: #999999;
text-shadow: 0 0 1px rgba(0,0,0,.35);
background: #771203;
-webkit-transition: all .3s ease 1s;
-moz-transition: all .3s ease 1s;
-o-transition: all .3s ease 1s;
-ms-transition: all .3s ease 1s;
transition: all .3s ease 1s;
}
.nav > li.nav-search input[type="text"]:focus { color: #fcfcfc; }
.nav > li.nav-search input[type="text"]:focus,
.nav > li.nav-search:hover input[type="text"] {
width: 110px;
padding: 15px 20px;
-webkit-transition: all .3s ease .1s;
-moz-transition: all .3s ease .1s;
-o-transition: all .3s ease .1s;
-ms-transition: all .3s ease .1s;
transition: all .3s ease .1s;
}
.nav > li.nav-search input[type="submit"] {
display: block;
float: left;
width: 20px;
height: 54px;
padding: 0 25px;
cursor: pointer;
background: #771203 url(../img/search-icon.png) no-repeat center center;
border-radius: 0 3px 3px 0;
-webkit-transition: all .3s ease;
-moz-transition: all .3s ease;
-o-transition: all .3s ease;
-ms-transition: all .3s ease;
transition: all .3s ease;
}
.nav > li.nav-search input[type="submit"]:hover { background-color: #4b4441; }
/* Menu Dropdown */
.nav > li > div {
position: absolute;
display: block;
width: 100%;
top: 50px;
left: 0;
opacity: 0;
visibility: hidden;
overflow: hidden;
background: #ffffff;
border-radius: 0 0 3px 3px;
-webkit-transition: all .3s ease .15s;
-moz-transition: all .3s ease .15s;
-o-transition: all .3s ease .15s;
-ms-transition: all .3s ease .15s;
transition: all .3s ease .15s;
}
.nav > li:hover > div {
opacity: 1;
visibility: visible;
overflow: visible;
}
/* Menu Content Styles */
.nav .nav-column {
float: left;
width: 20%;
padding: 2.5%;
}
.nav .nav-column h3 {
margin: 20px 0 10px 0;
line-height: 18px;
font-family: Helvetica, Arial, sans-serif;
font-weight: bold;
font-size: 14px;
color: #771203;
text-transform: uppercase;
}
.nav .nav-column h3.orange { color: #ff722b; }
.nav .nav-column li a {
display: block;
line-height: 26px;
font-family: Helvetica, Arial, sans-serif;
font-weight: bold;
font-size: 13px;
color: #888888;
}
.nav .nav-column li a:hover { color: #666666; }
Fiddle
My Probem
I want the menu items to be in an inline order(next to each other) just like the original menu but with 1400px or 100% width and menu the items are in the middle.

Answer 1

You can use display:flex for this purpose. Check the solution below, and here's the fiddle
.nav,
.nav a,
.nav ul,
.nav li,
.nav div,
.nav form,
.nav input {
margin: 0;
padding: 0;
border: none;
outline: none;
}
.nav a { text-decoration: none; }
.nav li { list-style: none; width:100%; }
/* Menu Container */
.nav {
display: flex;
position: relative;
cursor: default;
z-index: 500;
}
/* Menu List */
.nav > li {
float: left;
}
/* Menu Links */
.nav > li > a {
position: relative;
display: inline-flex;
width: 100%;
z-index: 510;
height: 54px;
padding: 0 20px;
line-height: 54px;
font-family: Helvetica, Arial, sans-serif;
font-weight: bold;
font-size: 13px;
color: #fcfcfc;
text-shadow: 0 0 1px rgba(0,0,0,.35);
background: #771203;
border-left: 1px solid #4b4441;
border-right: 1px solid #312a27;
-webkit-transition: all .3s ease;
-moz-transition: all .3s ease;
-o-transition: all .3s ease;
-ms-transition: all .3s ease;
transition: all .3s ease;
}
.nav > li:hover > a { background: #4b4441; }
.nav > li:first-child > a {
border-radius: 3px 0 0 3px;
border-left: none;
}
/* Search Form */
.nav > li.nav-search > form {
position: relative;
width: inherit;
height: 54px;
z-index: 510;
border-left: 1px solid #4b4441;
}
.nav > li.nav-search input[type="text"] {
display: block;
float: left;
width: 1px;
height: 24px;
padding: 15px 0;
line-height: 24px;
font-family: Helvetica, Arial, sans-serif;
font-weight: bold;
font-size: 13px;
color: #999999;
text-shadow: 0 0 1px rgba(0,0,0,.35);
background: #771203;
-webkit-transition: all .3s ease 1s;
-moz-transition: all .3s ease 1s;
-o-transition: all .3s ease 1s;
-ms-transition: all .3s ease 1s;
transition: all .3s ease 1s;
}
.nav > li.nav-search input[type="text"]:focus { color: #fcfcfc; }
.nav > li.nav-search input[type="text"]:focus,
.nav > li.nav-search:hover input[type="text"] {
width: 110px;
padding: 15px 20px;
-webkit-transition: all .3s ease .1s;
-moz-transition: all .3s ease .1s;
-o-transition: all .3s ease .1s;
-ms-transition: all .3s ease .1s;
transition: all .3s ease .1s;
}
.nav > li.nav-search input[type="submit"] {
display: block;
float: left;
width: 20px;
height: 54px;
padding: 0 25px;
cursor: pointer;
background: #771203 url(../img/search-icon.png) no-repeat center center;
border-radius: 0 3px 3px 0;
-webkit-transition: all .3s ease;
-moz-transition: all .3s ease;
-o-transition: all .3s ease;
-ms-transition: all .3s ease;
transition: all .3s ease;
}
.nav > li.nav-search input[type="submit"]:hover { background-color: #4b4441; }
/* Menu Dropdown */
.nav > li > div {
position: absolute;
display: block;
width: 100%;
top: 50px;
left: 0;
opacity: 0;
visibility: hidden;
overflow: hidden;
background: #ffffff;
border-radius: 0 0 3px 3px;
-webkit-transition: all .3s ease .15s;
-moz-transition: all .3s ease .15s;
-o-transition: all .3s ease .15s;
-ms-transition: all .3s ease .15s;
transition: all .3s ease .15s;
}
.nav > li:hover > div {
opacity: 1;
visibility: visible;
overflow: visible;
}
/* Menu Content Styles */
.nav .nav-column {
float: left;
width: 20%;
padding: 2.5%;
}
.nav .nav-column h3 {
margin: 20px 0 10px 0;
line-height: 18px;
font-family: Helvetica, Arial, sans-serif;
font-weight: bold;
font-size: 14px;
color: #771203;
text-transform: uppercase;
}
.nav .nav-column h3.orange { color: #ff722b; }
.nav .nav-column li a {
display: block;
line-height: 26px;
font-family: Helvetica, Arial, sans-serif;
font-weight: bold;
font-size: 13px;
color: #888888;
}
.nav .nav-column li a:hover { color: #666666; }
<div id="wrapper">
<div id="header"><img id="all" src="img/qa.png" alt="xxx"/></div>
<div id="menu-wrapper">
<ul class="nav">
<li>
Home
<div>
<div class="nav-column">
<h3>Home</h3>
<ul>
<li>Pampers Diapers</li>
<li>Huggies Diapers</li>
<li>Seventh Generation</li>
<li>Diapers</li>
<li>Derbies</li>
<li>Driving shoes</li>
<li>Espadrilles</li>
<li>Loafers</li>
</ul>
</div>
<div class="nav-column">
<h3>Home</h3>
<ul>
<li>Driving shoes</li>
<li>Espadrilles</li>
<li>Loafers</li>
</ul>
<h3>Home</h3>
<ul>
<li>Driving shoes</li>
<li>Espadrilles</li>
<li>Loafers</li>
</ul>
</div>
<div class="nav-column">
<h3>Home</h3>
<ul>
<li>Pampers Diapers</li>
<li>Huggies Diapers</li>
<li>Seventh Generation</li>
<li>Diapers</li>
<li>Derbies</li>
<li>Driving shoes</li>
<li>Espadrilles</li>
<li>Loafers</li>
</ul>
</div>
<div class="nav-column">
<h3 class="orange">Related Categories</h3>
<ul>
<li>Pampers Diapers</li>
<li>Huggies Diapers</li>
<li>Diapers</li>
</ul>
<h3 class="orange">Brands</h3>
<ul>
<li>Driving shoes</li>
<li>Espadrilles</li>
</ul>
</div>
</div>
</li>
<li>MOE</li>
<li>
EEC-SEAA
<div>
<div class="nav-column">
<h3 class="orange">Related Categories</h3>
<ul>
<li>Pampers Diapers</li>
<li>Huggies Diapers</li>
<li>Diapers</li>
</ul>
<h3 class="orange">Brands</h3>
<ul>
<li>Driving shoes</li>
<li>Espadrilles</li>
</ul>
</div>
<div class="nav-column">
<h3>Home</h3>
<ul>
<li>Pampers Diapers</li>
<li>Huggies Diapers</li>
<li>Seventh Generation</li>
<li>Diapers</li>
<li>Derbies</li>
<li>Driving shoes</li>
<li>Espadrilles</li>
<li>Loafers</li>
</ul>
</div>
<div class="nav-column">
<h3>Home</h3>
<ul>
<li>Driving shoes</li>
<li>Espadrilles</li>
<li>Loafers</li>
</ul>
<h3>Home</h3>
<ul>
<li>Driving shoes</li>
<li>Espadrilles</li>
<li>Loafers</li>
</ul>
</div>
<div class="nav-column">
<h3>Home</h3>
<ul>
<li>Pampers Diapers</li>
<li>Huggies Diapers</li>
<li>Seventh Generation</li>
<li>Diapers</li>
<li>Derbies</li>
<li>Driving shoes</li>
<li>Espadrilles</li>
<li>Loafers</li>
</ul>
</div>
</div>
</li>
<li>About Us</li>
<li>Our Achievements</li>
<li class="nav-search">
<form action="#">
<input type="text" placeholder="Search...">
<input type="submit" value="">
</form>
</li>
</ul>
</div>
</div>