mat.services/sass/style/parts/_header.scss

h1.page-header {
  font-size: 2.75em;
  line-height: 100%;
  font-family: var(--header-font);
  margin-top: 4rem;
  margin-bottom: 1rem;

  max-width: 720px;
}

.centered-header {
  font-family: var(--header-font);
  text-align: center;
  font-size: 4em;
  line-height: 4rem;
  padding-top: 5rem;
  padding-bottom: 5rem;

  h1.page-header {
    margin: 0;
    max-width: 100%;
    min-width: 100%;
  }
}

header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  padding: 1em 0;
}

header .main {
  font-size: 1.5rem;

  /* Otherwise header and menu is too close on small screens*/
  margin-bottom: 10px;
}

.meta {
  color: var(--text-1);
  letter-spacing: -0.5px;
}

h2,
h3,
h4,
h5,
h6 {
  margin-top: 1.5rem;
}

h2 {
  font-size: 1.5rem;

  &::before {
    color: var(--primary-color);
    content: "# ";
  }
}

h3 {
  font-size: 1.4rem;

  &::before {
    color: var(--primary-color);
    content: "## ";
  }
}

h4 {
  font-size: 1.3rem;

  &::before {
    color: var(--primary-color);
    content: "### ";
  }
}

h5 {
  font-size: 1.2rem;

  &::before {
    color: var(--primary-color);
    content: "#### ";
  }
}

h6 {
  font-size: 1.1rem;

  &::before {
    color: var(--primary-color);
    content: "##### ";
  }
}

.header-dot {
  font-family: var(--system-font);
  font-size: 5rem;
  line-height: 1rem;
}

.post-list-item>.title {
  line-height: 2rem;
}