.npc label > input{ /* HIDE RADIO */
  visibility: hidden; /* Makes input not-clickable */
  position: absolute; /* Remove input from document flow */
}

.npc label > img{ /* IMAGE STYLES */
  cursor:pointer;
  border:3px solid transparent;
}
        
.npc label > input:checked + img{ /* (RADIO CHECKED) IMAGE STYLES */
  border: 3px solid var(--highlightcolor);
}