"Do not tell me how to make sure that when you hover on an element it changes color and the other elements darken."
Well, I'll go easier, there is a menu, there are 5 elements in it, pointing the cursor at one element, it changes color with me, and the other elements in the menu change color to another.
There is no groundwork, I understand the principle. If this is easier, here is a list of 5 items.
<div class="nav"> <ul> <li><a href=""></a></li> <li><a href=""></a></li> <li><a href=""></a></li> <li><a href=""></a></li> <li><a href=""></a></li> </ul> </div>