html, body {
  margin: 0;
  padding: 0;
}

* {
  box-sizing: border-box;
}

.promotion {
  margin: auto;
  padding: 20px 0;
  max-width: 960px;
  text-align: center;
}
.promotion__title {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-h1);
  margin-bottom: 24px;
  position: relative;
  color: var(--color-4);
}
.promotion__title::before,
.promotion__title::after {
  content: "";
  flex: 1;
  height: 1px;
  background-color: var(--color-4);
  margin: 0 16px;
}
.promotion__video {
  aspect-ratio: 16 / 9;
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
  background: #000;
  position: relative;
}
.promotion__video iframe {
  width: 100%;
  height: 100%;
  border: 0;
  display: block;
}
.footer {
  padding-inline-end: 20px;
  text-align: right;
}
@media screen and (max-width: 480px) {
  .promotion__title {
    font-size: 1.7rem;
    margin-bottom: 1px;
  }
  .promotion__title::before,
  .promotion__title::after {
    margin: 0 8px;
  }
}