.main-content {
  width: 800px;
}
@media screen and (max-width: 700px) {
  .main-content {
    width: 90%;
  }
  h1 {
    margin: 10px 0 20px;
  }
  h2 {
    margin-bottom: 10px;
  }
  p {
    margin-bottom: 10px;
  }
}