.icon {

background-image: url('sprite-alert-white.png');

}

.icon-ic_error_white_24dp {

background-position: -5px -5px;
width: 24px;
height: 24px;

}

.icon-ic_warning_white_24dp {

background-position: -39px -5px;
width: 24px;
height: 24px;

}