How to Make Button Tag Only Show Image Inside of it

I have the following code for a submit button on my website:

<button name="searchterm" type="submit" id="searchterm"><img src="images/ICON_Go.jpg"></button>

and the following CSS:

#searchterm {
    margin:0px;
    padding:0px;
    white-space:nowrap;
    width:auto;
    overflow:visible;
}

and this is how it appears on the live website:

enter image description here

I would just like it to be the green go image. I do not want the button graphic surrounding the image. How can I do this?

Thank you for any help. All help is appreciated.

Solution

Add this to remove the background color and the border:

#searchterm {
    border:0;
    background:transparent.
}