.header-placeholder {
  height: 0;
}

.material-header {
  aspect-ratio: 750 / 1334;
  display: flex;
  align-items: center;
  background-image: url(/assets/img/material/material.png);
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center center;
}

.material {
  padding-bottom: 20vw;
}

.material .layout {
  padding: 0 4vw;
}

.material .title {
  padding: 16vw 0 6vw;
  font-size: var(--h1);
  color: var(--color1);
}

.material .subtitle {
  font-size: var(--h3);
  color: var(--color2);
  line-height: 1.5;
}

.material .desc {
  padding: 6vw 0 0;
  font-size: var(--h4);
  color: var(--color1);
  line-height: 1.5;
}

.material .flex-imgs {
  margin-top: 6vw;
  display: flex;
  gap: 15px;
}

.material .flex-imgs img {
  flex: 1;
}