When you click No border to remove the border of an image on a Microsoft SharePoint Foundation 2010 page, the border remains. This problem occurs when the image is linked.
To work around this problem, use one of the following methods:
Change the .ms-rteImage-0 cascading style sheetsrule to include "border:0px" in the .css file of the site that contains the page. This rule can usually be found in the Controls.css file that is located in the following path: /style library/language folder/Themable/Core Styles
Note The language folder placeholder is the placeholder for the language folder of the Web site.
Add border="0" to the <img> tag manually. To edit the HTML source of this page, click the HTML drop-down list, and then click HTML Source.