Setting a background image to input is dependent on browser
  • background-image for Firefox, Opera, Safari & Edge 
    .bgnw
{
	background-image:url('darkglass.png');
	width:100px;
	height:60px;
}
  • For IE & Others 
    .bg
{
	background:white url('darkglass.png') repeat scroll 0 0;
	width:100px;
	height:60px;
	border:solid 1px;
}
Note: In future when microsoft start supporting background-image, this post would become void.

Below is the sample