I have some text on my website whose visibility is not very good and i want to change it’s text color or background color, but i am not able to find it in my css file.

the part which is highlighted in red is one whose color i want to change.
you can see it yourself at AnHits.com
just Login with this demo account – username – demo password – demo
and hover the mouse over Earn Coins on top right.
here is my main css file – http://www.anhits.com/css/style.css
here is the source code part which shows that test on my website –
<div class="cont soft-blue fixed">
<div class="menu">
<div class="menu-wrap">
<ul id="main_menu">
<li><a href="index.php">Home</a></li>
<li><a href="blog/index.php">Blog</a></li>
</ul>
<li>
<a href="index.php">Earn Coins</a>
<ul>
<li><a href="surf.php" target="_blank">Traffic Exchange</a></li>
.
.
.
.
Thanks in advance!
You can use Inspect Element option which lies in Chrome’s Inspector and Also in Mozilla Firefox’s Firebug Inspector. To get related styles and where they lie in your CSS.
And for now @Kolink and also @PraveenKumar has answered. You may refer to it if you just want support for this situation.