body {
  background-color: #f6f6f6;
}
#navbar {
  position: fixed;
  top: 0;
  left: 0;
  padding: 30px;
  width: 300px;
  height: 100vh;
  background-color: white;
}
.nav-link {
  font-size: 20px;
  display: flex;
  flex-direction: column;
}
.nav-link {
  text-decoration: none;
  color: black;
  border-bottom: 1px solid grey;
  padding: 10px;
}
.nav-link:hover {
  background-color: #eee;
  font-weight: 700;
  transition: background-color 0.1s ease-in-out;
}
#main-doc {
  margin-left: 400px;
  margin-right: 20px;
}
@media (max-width: 1200px) {
  #navbar {
    width: 150px;
  }
  h1 {
    font-size: 22px;
  }
  #main-doc {
    margin-left: 250px;
  }
}
.main-section {
  margin: 50px 0;
}