Gantry Framework-Joomla How to edit logo from CSS - css

I would like to know how can I edit CSS files(ex:Logo size, Logo path)
I am using Grantry v4.1.24 and Joomla 3.3.1
See the example of how to change Logo;
#rt-logo {
background: url("/qatarclean/joomla_gantry/images/logo.png") no-repeat scroll 50% 0 transparent !important;
}
#rt-logo {
height: 140px;
width: 267px;
}
How can I find the CSS location for this and how to edit this?
in Firebug it is only showing the only the folder path.
I have created gantry-custom.css file and inserted above data. It doesn't work.
See the attached picture;
Also I want to know how to remove some lines from selected CSS file;
Thanks in Advance,
Sameera Silva

The Gantry Framework uses compiled LESS files. Rather than editing these directly, it is recommended (as you have done) that a custom CSS or custom LESS file is created so that your changes are not overwritten by a template update.
The use of !important might be the reason your override is not working.
You can get around this using CSS specificity as explained by Henning on the RocketTheme Forums at: http://www.rockettheme.com/forum/configuration-and-security/209832-want-nail-how-2use-template-name-custom-css-file-correctly#1028846
For more information on CSS specificity Henning recommends: http://www.smashingmagazine.com/2007/07/27/css-specificity-things-you-should-know
In this particular case, the following should fix the issue you are having:
div#rt-logo {
background: url("/qatarclean/joomla-gantry/images/logodf.png") no-repeat scroll 50% 0 transparent !important;
}

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ok #st3ph3n92 it is working for me !!!
I just write custom css for the 10-20 products I have online every day so for now I am fine !!!
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Thank you St3ph3n92 for your answer
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}
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<div class="product-image"><div>
I mean that I want something more automatic cause I have 700+ products so I cant insert custom URLS for each one !!! I need a code so on hover my main Products image change with the second image from Product Gallery
Thanks again for your answer !!!
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See similar question here
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where last word after __(dauble underscore) will added dynamically
as
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index.html:
<link rel="stylesheet" type="text/css" media="screen" href="style.php">
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