body {
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  background: #ddd;
}
.image-area {
  width: auto;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  mix-blend-mode: normal;
  pointer-events: none;
  user-select: none;
  margin: auto;
}

.a {
  position: absolute;
  width: auto;
  height: 100%;
  display: flex;
  box-shadow: 0 5px 40px rgba(0, 0, 0, 6);
}

a img {
  position: absolute;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;
  width: auto;
  height: 100%;
  margin: auto;
}

a img:nth-child(2) {
  clip-path: circle(15% at var(--x) var(--y));
}

a:hover img:nth-child(2) {
  clip-path: circle(15% at var(--x) var(--y));
}