.icon {
background-image: url('sprite-alert-grey600.png');
}
.icon-ic_error_grey600_24dp {
background-position: -5px -5px; width: 24px; height: 24px;
}
.icon-ic_warning_grey600_24dp {
background-position: -39px -5px; width: 24px; height: 24px;
}