.main-body {
  display: grid;
  grid-template-columns: minmax(300px, auto) 1fr;
  grid-template-areas: "navbar content";
  padding-top: 3rem;
  max-width: 60rem;
  margin: 0 auto;
}

#navbar {
  position: fixed;
}

#navbar a {
  display: block;
  border-bottom: 1px solid #000;
  padding: 5px;
  margin: 10px 0;
  text-decoration: none;
  color: #000;
  transition: all 0.3s;
}

#main-doc {
  grid-area: content;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Roboto", sans-serif;
  margin: 0;
  padding: 0;
}

.bold {
  font-weight: bold;
}

ul > li {
  margin: 8px 0;
}

header {
  font-size: 1.5em;
  font-weight: bold;
  margin: 10px 0px;
}

code {
  background-color: #ddd;
  display: block;
  margin: 15px 0px;
  padding: 15px;
  border-radius: 10px;
  line-height: 20px;
}

@media screen and (max-width: 768px) {
  .main-body {
    grid-template-columns: 1fr;
    grid-gap: 20px;
    grid-template-areas: "navabar" "content";
  }

  #navbar {
    position: inherit;
    padding: 0 3rem;
  }

  #main-doc {
    padding: 0 3rem;
  }
}