sprites/css-sprite/sprite-alert-white.css

.icon {
  background-image: url(../images/sprite-alert-black.PNG);
}
.icon-ic_add_alert_black_24dp {
  background-position: -0px -0px;
  width: 32px;
  height: 32px;
}
.icon-ic_error_black_24dp {
  background-position: -32px -0px;
  width: 32px;
  height: 32px;
}
.icon-ic_error_outline_black_24dp {
  background-position: -0px -32px;
  width: 32px;
  height: 32px;
}
.icon-ic_warning_black_24dp {
  background-position: -32px -32px;
  width: 32px;
  height: 32px;
}
.icon {
  background-image: url(../images/sprite-alert-white.PNG);
}
.icon-ic_add_alert_white_24dp {
  background-position: -0px -0px;
  width: 32px;
  height: 32px;
}
.icon-ic_error_outline_white_24dp {
  background-position: -32px -0px;
  width: 32px;
  height: 32px;
}
.icon-ic_error_white_24dp {
  background-position: -0px -32px;
  width: 32px;
  height: 32px;
}
.icon-ic_warning_white_24dp {
  background-position: -32px -32px;
  width: 32px;
  height: 32px;
}