Bind child element position to parent element - html

Question

I have a navigation that is horizontal. Under every choice I have a div that opens up on click. But the problem is that it binds it's position to the parent navigation button. I want every div that opens on the exact same spot. I want every child div that opens to open from the first element in the navigation bar.
So in this case i want the white open div to bind to "Nyheter" instead. I really can't solve it, I tried set a div element before the navigation that all div that opens binds to in css but it not seems to work.
<div class="Container">
<nav class="NavHorizontal Grid Grid--alignMiddle">
#Navigation.RenderNavigation("master/navigationDesignHeader.cshtml", navigationSettings)
</nav>
</div>
//NavigationDesignheader.cshtml under this line
var elementId = 1;
foreach (var node in nodes)
{
var idElement = "megaMenu" + elementId;
<div class="NavHorizontal-item Grid-cell u-sizeFit" id="#idElement">
<a class="Button Button--tab navigationHeaderLink u-pointer" onclick="toggleMenu('#elementId')">
#node.Name
</a>
#RenderMegaMenu(node.Nodes, node.Link, node.Name)
</div>
elementId++;
}
Megamenu:
<div>
<div id="megaMenuDropdown" class="Container megaMenuDropdown-content displayNone">
<div class="Grid Grid--withGutter">
<div class="Grid-cell u-sizefull u-mt-10">
#nodeName
<div class="megaMenuToggle-closeBars u-pointer" style="float:right">
<span class="megaMenuToggle-closeBar"></span>
<span class="megaMenuToggle-closeBar"></span>
</div>
</div>
</div>
<hr class="colorBlue" />
<div class="Grid Grid--withGutter">
<div class="Grid-cell u-size12of12 u-md-size6of12 u-lg-size6of12">
<ul>
#foreach (var node in firstColumn)
{
<li class="u-mb-10 linkHover">
<a class="userLink colorBlue" href="#node.Link">#node.Name</a>
</li>
}
</ul>
</div>
#if (moreThanTen)
{
<div class="Grid-cell u-size12of12 u-md-size6of12 u-lg-size6of12">
<ul>
#foreach (var node in secondColumn)
{
<li class="u-mb-10 linkHover">
<a class="userLink colorBlue" href="#node.Link">#node.Name</a>
</li>
}
</ul>
</div>
}
</div>
</div>
</div>
Any suggestions?