html - Sizing the Mega Menu to page width and centering it -


i trying make mega menu width of #header , centered middle. max-width of header 1024px. dropdown menu keeps starting @ edge of parent li. managed hack margins, that's not permanent solution means. i've removed margins sake of question.

html

<header>     <div id="header">         <div class="row">         <div class="medium-3 columns">         <div id="logo">             <a href="#"><img alt="logo" src="http://dummyimage.com/174x114/828282/0011ff.png"/></a>         </div>         </div>         <div class="medium-7 columns">             <ul class="nav clearfix animated">                 <li class="border-half"><a href="#">home</a></li>                 <li class="border-half">                     <a href="#">series</a>                     <div class="mega-container1">                         <div style="width: 1000px; height: 290px;"></div>                     </div>                 </li>                 <li class="border-half"><a href="#">members</a>                     <div class="mega-container2">                         <div style="width: 1000px; height: 290px;"></div>                     </div>                 </li>                 <li class="border-half">                     <a href="#">about</a>                     <div class="mega-container3">                         <ul style="width: 1000px; height: 290px;">                             <li><a href="#">who are</a></li>                             <li><a href="#">why care</a></li>                             <li><a href="#">some other page</a></li>                             <li><a href="#">how work</a></li>                         </ul>                     </div>                 </li>                 <li class="border-half"><a href="#">contact us</a></li>             </ul>         </div>         <div class="medium-2 columns">         </div>     </div>     </div> </header>

css

body {font-size: 16px; background: #cacaca;} #wrapper{width: 100%; height: 100%; padding: 0; margin: 0; background: #cacaca;} header {width: 100%; max-height: 7.188em; background: #fff; border-bottom: 0.063em solid $header-border; z-index: 1;} #header{max-width: 1024px; height: 7.125em; margin: 0 auto; padding: 0; background: #cdecde} #logo {max-width: 10.875em; max-height: 7.125em; float: left; background: #eee;} * { -moz-box-sizing: border-box; -webkit-box-sizing: border-box; box-sizing: border-box;} * { -moz-box-sizing: border-box; -webkit-box-sizing: border-box; box-sizing: border-box;} .nav {     background: #cdecde;     max-width: 500px;     height: 114px; }  .nav li { list-style: none;  } .nav > li { padding: 0; float: left; position: relative; } .nav > li > {     float: left;     color: $body-font-color;     font-size: $paragraph-font-size;     text-decoration: none;     line-height: 114px;     padding: 0 20px;      height: 114px;     position: relative;     border-left: 1px solid #fff; } .nav > li:hover > { background: #f7f7f7; border-left: 1px solid #f1f1f1;} .nav > li:first-child > {  } .nav > li:last-child > { border-right: 0;} .nav > li:hover > div { display: block; }  /* mega dropdown */  .nav > li > div {     position: absolute;     top: 114px;     display: none;     background: #f7f7f7;     padding: 10px 10px;     box-shadow: 0 2px 3px rgba(0,0,0,0.1);     overflow: hidden;     border-bottom: 4px solid $primary-color;     border-left: 1px solid $header-border;     border-right: 1px solid $header-border;     z-index: 2;     max-width: 1024px;     height: auto;     margin: 0 auto; }  .mega-container1 {      left: ; } .mega-container2 {      left: ; } .mega-container3 {      left: ; } .clearfix:after {   content: ".";   display: block;   height: 0;   clear: both;   visibility: hidden; } .border-half {     border-right: 1px solid #f0f0f0;     position: relative; } .border-half:before {     border-left: 1px solid #cdecde; } .border-half:after {     content: '';     display: block;     position: absolute;     height: 50px;     top: 0px;     right: -1px;     border: 1px solid #cdecde; } .border-half:hover::after {     right: -3px; }

here jsfiddle idea: http://jsfiddle.net/7e3esmpx/

update 1: explanation little confusing.

alright think have solution problem. understanding, want hidden divs appear when hovered, , take entire screen's width. correct? that:

first add position of fixed , left margin of 0 nav li divs when hovered. i.e.:

.nav > li:hover > div { display: block;                         position: fixed;                         left: 0}

change max width on nav li divs contain entire screen. i.e.:

.nav > li > div { position: absolute; top: 114px; display: none; background: #f7f7f7; padding: 10px 10px; box-shadow: 0 2px 3px rgba(0,0,0,0.1); overflow: hidden; border-bottom: 4px solid $primary-color; border-left: 1px solid $header-border; border-right: 1px solid $header-border; z-index: 2; max-width: 1800px; height: auto; margin: 0 auto; }

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