header {
  text-align: center;
}

section {
  padding: 10vh 2rem;
  margin: 0 auto;
}

section.about {
  padding-top: 6rem;
}

h1 {
  font-size: 3.5rem;
  font-weight: 300;
  margin-bottom: .5rem;
  padding-top: 3rem;
}

h1 + p {
  font-size: 1.25rem;
  margin: 0 0 .5rem;
}

h2 {
  font-size: 2rem;
  font-weight: 200;
  margin-bottom: 2rem;
}

h3 {
  margin-bottom: 1rem;
  font-size: 1.5rem;
}

p {
  line-height: 1.4;
}

hr {
  margin: 3rem 0 ;
}

li {
  line-height: 1.5;
}

.three-col-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.theme-selector {
  position: fixed;
  right: 2rem;
  top: 1rem;
}

select {
   padding: .5rem;
}

@media (min-width: 768px) {
  h1 {
    padding: 0;
  }

  section {
      max-width: 70vw;
      padding: 20vh 2rem;
  }

  .three-col-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}