.compare-action{
background-image: url('http://samplea.wpresidence.net/wp-content/themes/wpresidence-child/css/css-images/unit.png')!important;
}

.compare-action:hover{
background-image: url('http://samplea.wpresidence.net/wp-content/themes/wpresidence-child/css/css-images/unit.png')!important;
}