title: Sharepoint Designer 2010, CSS and master page
body: <p>Part of my job is to be able to change the css of a Sharepoint 2010 enterprise site. I've the possibility to use Sharepoint Designer. I've used it to make a copy of v4.master, set it as master page, added a few lines:</p>
  
  <pre><code>&lt;SharePoint:CssRegistration runat="server" name="/Style Library/... myfile.css" After="corev4.css"/&gt;
  &lt;SharePoint:CssRegistration runat="server" name="/Style Library/... myfile.css" After="corev4.css"/&gt;
  </code></pre>
  
  <p>Two questions:</p>
  
  <p>1) Is there any danger in making a new master page via Sharepopint Designer if you only add these lines of code? </p>
  
  <p>I've seen some people writing about Sharepoint Designer being a little risky. I'm no coder myself. My only use of SP Designer is adding these lines in a master page and editing the CSS in Style Library.</p>
  
  <p>2) We have <em>lots</em> of subsites. When I want to change the design on just one or two of these, should I continue the same path and add a uniqe css file in Style Library and link this file in a master page copy on the subsite?</p>