Branding SharePoint : Customize SharePoint CSS

There are two ways to update SharePoint CSS.

• Add Alternate Access CSS on your site.
• Update the default SharePoint CSS file.

Default SharePoint CSS is available on following paths:

• Sharepoint 2013 : C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\15/1033\styles\Themable\corev15.css
• Sharepoint 2010 : C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14\TEMPLATE\LAYOUTS\1033\STYLES\CoreV4.css

You can update these CSS files as per your needs. This Link provides quite a good details on the styles. This CSS file is directly linked in the master page of the site and hence impact the complete site.

Alternate Access CSS: Updating the default CSS could even impact the whole site badly if you are not good with CSS. So this is the alternate option. Go to Master page from Site Settings. Here you will find find a place to put in the URL of a CSS file. Styles in this file are given more importance than default CSS file. So we can create a CSS file, store it any where on the SharePoint and connect here.