styles.css

body {
  margin: 0;
}

#img {
  width: 100vw;
  height: 100dvh;
  object-fit: cover;
  position: fixed;
  background-size: cover;
  background-position: center;
}

main {
  height: 300dvh;
}

header {
  align-items: flex-end;
  animation: slideInDown forwards 1s ease-out;
  background: linear-gradient(40deg, #ba3816, #a41705 40%);
  border-radius: 50%;
  display: flex;
  height: 30rem;
  justify-content: center;
  left: 50%;
  margin-top: -22rem;
  position: absolute;
  top: 0;
  transform: translate(-50%, -25%);
  width: 30rem;
  z-index: 1;

  img {
    width: 200px;
    margin: 0 auto;
    height: auto;
    margin-bottom: 60px;
  }
}

@keyframes slideInDown {
  from {
    transform: translate3d(-50%, -100%, 0);
    opacity: 0;
  }

  to {
    transform: translate3d(-50%, 0, 0);
    opacity: 1;
  }
}