.image-inset-headline {
  position: relative;
}

.image-inset-headline img,
.image-inset-headline video {
  width: 100vw;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 86% 100%, 86% 86%, 14% 86%, 14% 100%, 0 100%);
}
.image-inset-headline h1 {
  text-align: center;
  font-size: 2.5vw;
  margin-top: -3.5vw;
  margin-left: 16vw;
  margin-right: 16vw;
}

@media only screen and (max-width: 900px) {
  .image-inset-headline h1 {
    font-size: 2rem;
  }
}