.about-section {
  position: relative;
}

.about-section .top-image {
  position: absolute;
  top: -40px;
  z-index: -1;
}

.about-section .bottom-image {
  position: absolute;
  bottom: -40px;
  left: 0;
  transform: rotate(180deg);
  z-index: -1;
}