Need help with CSS to style Drupal active-trail

Below is my page structure. Let's say I want my active-trail to be red. I have tried every combination of CSS I can think of to make this happen.

<div id="menu">
<ul class="links primary_menu">
<li class="menu-121 active-trail first">
</li>
</div>

Can anyone help me find the correct CSS?

Thank you!

 

Thanks, I figured it out.

#menu .primary_menu li.active-trail a {
color: red;
}