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Microsoft SharePoint 2010 has many ways to customize its user interface. Site owners can configure an alternative CSS file, apply a custom theme, or modify an existing one.
The CSSLink web control is in SharePoint master pages and is responsible for rendering the HTML element. The CSSLink control works with the CSSRegistration controls. If there are CSSRegistration controls on the page, the CSSLink control registers and renders the additional CSS file references that the registration control makes.
Do you need a copy of the CSS master page in SharePoint?
To examine the CSS web server controls in SharePoint, you must get copy of the master page that is used on the site. But to download a copy of the master page for your site, you have to know which master page your site uses. Use one or more of the following to determine what master page your site uses:
Which is the default style sheet in SharePoint?
SharePoint branding-related artifacts are files and resources that are installed and deployed with SharePoint, or are added later by site owners and developers. This section shows how to locate and manipulate the default style sheets and master pages in SharePoint.
Use one or more of the following to determine what master page your site uses: On a SharePoint Server 2010 site where Publishing Features are enabled and activated, access the Site Master Page Settings page via Site Actions, Site, Settings. Then, under the Look and Feel section, click the Master Page link.
When we make changes to our corev4.css in the _themes folder in the root of our SharePoint 2010 site it shows up on the root URL but not on any subsites even though we did select the check box “Reset all subsites to inherit the system master page setting”.