/* El <li> que contiene enlace + imagen será el contenedor relativo */
.block-inline-blockimages.block-view-mode-default
  .field--name-field-images ul li.field__item {
  position: relative !important;
  display: inline-block !important;
  width: 100% !important;
}

.block-inline-blockimages.block-view-mode-default
  .field--name-field-images ul li.field__item
  .field--name-field-media-image-1 {
  	margin: 0;
  }

/* La imagen ocupa todo el ancho del <li> */
.block-inline-blockimages.block-view-mode-default
  .field--name-field-images ul li.field__item
  .field--name-field-media-image-1 img {
  display: block !important;
  width: 100% !important;
  height: auto !important;
}

/* El enlace se superpone sobre la imagen */
.block-inline-blockimages.block-view-mode-default
  .field--name-field-images ul li.field__item
  .field--name-field-link a {
  position: absolute !important;
  top: 0 !important;
  left: 0 !important;
  width: 100% !important;
  height: 100% !important;
  z-index: 10 !important;

  display: flex !important;
  align-items: center !important;
  justify-content: center !important;

  background: rgba(0, 0, 0, 0.45) !important;
  color: #fff !important;
  font-size: 30px !important;
  text-decoration: none !important;
  text-align: center !important;

  padding: 20px !important;
  box-sizing: border-box !important;
}

/* Hover opcional */
.block-inline-blockimages.block-view-mode-default
  .field--name-field-images > .field__item
  .field--name-field-link a:hover {
  background: rgba(0, 0, 0, 0.65) !important;
}