body {
  font-family: "Open Sans";
  font-size: 18px;
  color: #292828;
  margin: 0;
  padding: 0;
  line-height: 1.5;
  background-color: white;
}
#navbar {
  width: 300px;
  height: 100%;
  position: fixed;
  top: 0;
  left: 0;
  border-right: 2px solid #292828;
}
#navbar ul {
  height: 80%;
  padding: 0;
  overflow-x: hidden;
  overflow-y: auto;
}
#navbar li {
  list-style: none;
}
#navbar li:last-child {
  margin-bottom: 10px;
}
#navbar header{
  width: 100%;
  margin: 20px;
}
.nav-link {
  display: block;
  width: 100%;
  height: 35px;
  color: #292828;
  text-decoration: none;
  font-size: 20px;
  padding: 5px 0 5px 20px;
  border-top: 1px solid black;

}
#main-doc {
  margin: 20px 0 100px 350px;
}
.main-section p {
  margin-left: 20px;
}
.main-section ul {
  margin-left: 20px;
}
.main-section ul li {
  margin: 10px 0;
}
header {
  font-size: 30px;
  font-weight: bold;
  color: black;
}
code {
  display: block;
  font-size: 16px;
  margin-left: 40px;
  background: #ffeff0;
  word-wrap: break-word;
  padding: .1rem .3rem .2rem;
  border-radius: .2rem;
}
@media only screen and (max-width: 900px) {
  #navbar {
    min-width: 300px; 
    width: 70%;
    height: 300px;
    position: relative;
    margin: 0 auto;
    border: none;
  }
  #navbar ul {
    border: 2px solid #292828;
  }
  #navbar li {
    list-style: none;
  }
  #navbar li:last-child {
    margin-bottom: 0;
  }
  #navbar header{
    margin: 20px 0;
    text-align: center;
  }
  #main-doc {
    margin: 20px 0 100px 0;
  }
  #main-doc header {
    text-align: center;
  }
}