hide submenus on nav - html

Question

I'm trying to create a drop-down menu. I had it working for a minute.
My code is as follows:
<nav id="nav">
<ul>
<li class="subNav">Some Page1
<ul>
<li>Related Page1<li>
<li>Related Page2<li>
</ul>
<li>
</ul>
</nav>
My CSS is as follows:
#nav li.subNav ul{
display: none;
}
#nav li.subNav:hover ul{
display: block;
}
I have three CSS files that relate to this page. One is basically a web-kit for font, and the other two are bowlerplate.css and my custom file customFile.css. The tag <#nav li.subNav:hover ul> show up in customFile.css, and <#nav li.subNav ul> diplays in bout custom and boilerplate when I check computed styles.
There are two things I wish to fix; the submenu lines up horizontally (I need it to go vertical) and the submenu isn't hidden. I had to nest /li tag around the ul, so that took care of one problem (they're now aligned under the parent tag).
I also noticed that the height and width have changed on my parent li. I understand it expanding to accommodate the list items, but the increased height seems a little odd.

Answer 1

Here's my solution to the above problem
#nav li.subNav:hover ul li {
visibility: visible;
width: 171px;
padding: 0;
cursor: pointer;
float: none !important;
display: block !important;
}