.imgtxt {
  width: fit-content;
  height: fit-content;
  display: inline-block;
  position: relative;
  
}
.imgtxt span {
  opacity: 0;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 99;
  font-size: 2.5rem;
  color: #FFF;
  filter: drop-shadow(1px 1px 0 black) 
    drop-shadow(-1px 1px 0 black)
    drop-shadow(1px -1px 0 black)
    drop-shadow(-1px -1px 0 black);
}
.imgtxt:hover span, .imgtxt:focus span {
  opacity: 1;
 
}
.imgtxt img, .imgtxt:focus img {
  width: 400px;
  height: 400px;
  color: transparent;
 opacity: 1;
 
 
}