HTML DIV contradicting a DIV that it is in - html

Question

For the navigation on a website I am making I am using a side bar that is set up using an unordered list. There are also multiple lists inside of lists. I used multiple div's too. I have now run into the issue that form inside of a div I need to set up some code that will contradict the div that it is in. In my case I have css of line-height: 35px; I need to edit this to become 15px.
Here is the code i need to edit it is the center( sub List )
<li>
<h2> Tech Ed. Classes</h2>
</div>
<div id="sidebarLinks"><!-- USE THIS DIV SECTION FOR A LIST WITH BULLET POINTS -->
<ul>
<li><strong><em>Main Page</em></strong></li>
<li>Construction</li>
<li>Drafting</li>
<li>Electronics</li>
<ul id="subList">
<li >INTRODUCTION TO ELECTRONICS</li>
<li>EXPLORING CAREERS IN ELECTRONICS</li>
</ul>
<li>Graphic arts </li>
<li>Manufacturing</li>
<li>Project Lead the Way</li>
<li>Transportation, Distribution, & Logitstics</li>
<li>Wood Working</li>
</ul>
</div>
</li>

Answer 1

You can do this simply by adding a css class to the elements you want to change to be different from the div they are in. For example:
li {
line-height: 35px;
}
.smaller {
line-height: 15px;
}
This CSS will make the line-height on all <li> elements equal to 35px, except for <li> elements with a class of smaller. Those will have a line-height of 15px. For example:
<ul>
<li>This will have a line height of 35 pixels.</li>
<li class="smaller">This will have a height of 15 pixels.</li>
</ul>
<ul class="smaller">
<li>This will have a line height of 15 pixels, the ul has a class of smaller.</li>
<li class="smaller">This will have a height of 15 pixels as well.</li>
</ul>
JSFiddle

Answer 2

I would suggest adding a more specific selector for the inner list. This method would not require any changes to your existing markup:
#sidebarLinks {
line-height: 25px;
}
#sidebarLinks #subList {
line-height: 15px;
}
Here is a fiddle demonstrating the above selectors: JSFiddle