material-design-icons/sprites/css-sprite/sprite-alert-grey600.css

Material Design icons by Google

.icon-alert-grey600 {
  background-image: url('sprite-alert-grey600.png');
}

.icon-alert-grey600-ic_error_grey600_24dp {
  background-position: -5px -5px;
  width: 24px;
  height: 24px;
}

.icon-alert-grey600-ic_warning_grey600_24dp {
  background-position: -39px -5px;
  width: 24px;
  height: 24px;
}