index-bk.css

#backdrop {
  position: absolute;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 999;
  background-color: rgba(0, 0, 0, 0.262);
  text-align: center;
}
#backdrop button {
  top: calc(50% - (58px / 2));
  right: calc(50% - (58px / 2));
  display: block;
    position: fixed;
}
#myImage {
  max-inline-size: '100%';
  block-size: 'auto';
}