.background-color {
  width: 100vw;
  position: relative;
  left: 50%;
  right: 50%;
  background-color: var(--blue-dark);
  padding: 0 5rem;
  row-gap: 0;
  margin: 100px -50vw;
  color: white;
}

.background-color::before,
.background-color::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100vw;
  height: 100px;
  background-repeat: no-repeat;
  background-size: 100% 100%;
  background-position: center;
  color: white;
}

.background-color::before {
  top: -100px;
  background-image: url("data:image/svg+xml;utf8,<svg viewBox='0 0 1000 100' preserveAspectRatio='none' xmlns='http://www.w3.org/2000/svg'><path d='M0 50 C175 25, 200 25, 500 50 S 800 75, 1000 50 L1000 100 L0 100' fill='%230D1833'/></svg>");
}

.background-color::after {
  bottom: -100px;
  transform: rotate(180deg);
  background-image: url("data:image/svg+xml;utf8,<svg viewBox='0 0 1000 100' preserveAspectRatio='none' xmlns='http://www.w3.org/2000/svg'><path d='M0 50 C175 25, 200 25, 500 50 S 800 75, 1000 50 L1000 100 L0 100' fill='%230D1833'/></svg>");
}