I have this button which i have added a custom icon to.
I would like to remove the lighter gray which is within the icon.

This lighter gray is not part of the icon, it's got to be somewhere within jquery's CSS which i should be able to overide.

What can I do to my CSS to accomplish this?
You can view source on the link i've provided but here is the current CSS:
.ui-icon-my-map {
background-image: url("images/103-map.png");
background-position: 4px 50%;
background-size: 26px 21px;
height: 24px;
margin-top: -12px !important;
width: 35px;
}
