Sharepoint - Remove link border from around image

You need to apply the style to the IMG, not the HREF.

This will show the blue border (at least in IE and Firefox, Chrome doesn't)

<a href="http://sharepoint.stackexchange.com">
   <img src="http://cdn.sstatic.net/sharepoint/img/logo.png">
</a>

Neither of these will, first using the 'old style' border attribute

<a href="http://sharepoint.stackexchange.com">
   <img src="http://cdn.sstatic.net/sharepoint/img/logo.png" border="0">
</a>

Next using inline styles

<a href="http://sharepoint.stackexchange.com">
   <img src="http://cdn.sstatic.net/sharepoint/img/logo.png" style="border:none;">
</a>

And using CSS to take off the border for all images

<style>
   a img {border:none}
</style>
<a href="http://sharepoint.stackexchange.com">
   <img src="http://cdn.sstatic.net/sharepoint/img/logo.png">
</a>

Add a Content Editor Webpart to the affected page. Edit the HTML for the webpart. Paste in the following text:

<style>
   a img {border:none}
</style>

This will remove borders from all images with links on the page.

Within SharePoint Designer right click on the image's web part and select picture properties, select appearance and change border thickness to 0 and the blue border disappears.