performance-art.fr/sites/all/modules/contrib/fields/geofield/includes/behaviors/css/openlayers_behavior_geofield.css

/**
 * @file
 * CSS for OpenLayers Draw Features Behavior
 */

.olControlEditingToolbar .olControlModifyFeatureItemActive {
  background-position: -0px -23px;
}

.olControlEditingToolbar .olControlModifyFeatureItemInactive {
  background-position: -0px -0px;
}