#event::before {
  content: "";
  width: 5.375rem;
  aspect-ratio: 32/8;
  background: none;
  position: absolute;
  bottom: calc(100% - 1px);
  left: calc(50% - 2.6875rem);
  z-index: 1;
}

.box {
  max-width: 69.625rem;
  margin-inline: auto !important;
  padding-inline: 2rem;
}