.c-text {
  font-size: 1.3rem;
  font-weight: 600;
}
.c-text::after {
  content: attr(data-text);
  position: absolute;
  top: 0;
  left: 0;
  color: transparent;
  clip-path: ellipse(45px 45px at -1.52% 55.83%);
  animation: spotlight 5s infinite;
  background-image: url(https://images.unsplash.com/photo-1557682224-5b8590cd9ec5?ixlib=rb-1.2.1&auto=format&fit=crop&w=600&q=60);
  background-size: 100%;
  background-position: center center;
  background-clip: text;
}

@keyframes spotlight {
  0% {
    clip-path: ellipse(45px 45px at -1.52% 55.83%);
  }
  50% {
    clip-path: ellipse(45px 45px at 100% 55.83%);
  }
  100% {
    clip-path: ellipse(45px 45px at -1.52% 55.83%);
  }
}