Branding the Search box in SharePoint 2010

By default SharePoint search box will look like below as shown in the figure.

Here we will see how we can modify the css of the search textbox in a SharePoint 2010 site.
Here we have made our custom master page and also custom css file. In the custom master page we have called our custom css file like below:

<SharePoint:CssRegistration runat="Server" Name="/_layouts/styles/OurCustomCSS.css" After="corev4.css"/>

And our css content code is like below:
.s4-search input.ms-sbplain {
background:#333333; border:1px solid #666666 !important; width:200px !important; height:17px;padding:2px;

color:#CCCCCC; line-height:20px;
}

After this the seach box will look like below.