edlp_d8/core/themes/bartik/css/components/image-button.css

/**
 * @file
 * Styles for Bartik's image buttons.
 */

.image-button.is-disabled:hover,
.image-button.is-disabled:active,
.image-button.is-disabled:focus,
.image-button.is-disabled {
  background: transparent;
  opacity: 0.5;
  cursor: default;
}