How to remove the grey highlight of a link Image?

[vesnamyname]

I have added a Image as a link on my MVC4 website and when i hover over the image a nasty grey highlight appears, is there a way to remove it?Here is my code below:\[code\]<div class="float-left"> <p> <a href="http://stackoverflow.com/questions/12814525/@Url.Action('Index')"> <img alt="HomePage" style="verticalalign:middle;" height="30px" src="http://stackoverflow.com/questions/12814525/~/Images/formvalue_logo.png"> </a> </p></div>\[/code\]

Thanks in advance.