[css] CSS: How to change colour of active navigation page menu

I'm trying to change the colour of the active or current page navigation link which is selected by the user on my website. What am I doing wrong? Thanks.

So far the CSS looks like this:

div.menuBar
{
   font-family: BirchStd;
   font-size: 40px;
   line-height: 40px;
   font-weight: bold;
   text-align: center;
   letter-spacing: -0.1em;
}

div.menuBar li{list-style:none; display: inline;}
div.menuBar li a:active{color:#FF0000;}
div.menuBar ul{margin:0;}

And my HTML calls a page template for the navigation menu using the include PHP function:

<div class="menuBar">
  <ul>
  <li><a href="index.php">HOME</a></li>
  <li><a href="two.php">PORTFOLIO</a></li>
  <li><a href="three.php">ABOUT</a></li>
  <li><a href="four.php">CONTACT</a></li>
  <li><a href="five.php">SHOP</a></li>
 </ul>

Add ID current for active/current page:

<div class="menuBar">
  <ul>
  <li id="current"><a href="index.php">HOME</a></li>
  <li><a href="two.php">PORTFOLIO</a></li>
  <li><a href="three.php">ABOUT</a></li>
  <li><a href="four.php">CONTACT</a></li>
  <li><a href="five.php">SHOP</a></li>
 </ul>

#current a { color: #ff0000; }

The CSS :active state means the active state of the clicked link - the moment when you clicked on it, but not released the mouse button yet, for example. It doesn't know which page you're on and can't apply any styles to the menu items.

To fix your problem you have to create a class and add it manually to the current page's menu:

a.active { color: #f00 }

<ul>
    <li><a href="index.php" class="active">HOME</a></li>
    <li><a href="two.php">PORTFOLIO</a></li>
    <li><a href="three.php">ABOUT</a></li>
    <li><a href="four.php">CONTACT</a></li>
    <li><a href="five.php">SHOP</a></li>
</ul>