* {
  font-family: "Open Sans", Arial, sans-serif;
  line-height: 1.5;
}

#navbar {
  display: block;
  position: fixed;
  min-width: 290px;
  top: 0px;
  left: 0px;
  width: 300px;
  height: 100%;
  border-right: 3px solid grey;
}
.nav-link {
  display: block;
  padding: 15px;
  border-top: 1px solid gray;
  color: gray;
  text-decoration: none;
}

main {
  position: absolute;
  margin-left: 320px;
  padding: 20px;
  margin-right: 40px;
  margin-bottom: 110px;
}

header {
  font-size: 25px;
  padding: 15px;
  text-align: center;
}

p,
ul {
  color: gray;
}

code {
  display: block;
  padding: 15px;
  width: 100%;
  background-color: lightgray;
}
@media (max-width: 600px) {
  #navbar {
    position: relative;
    max-height: 300px;
    width: 100%;
    overflow-y: scroll;
    margin: 0;
    padding: 0;
    margin-bottom: 40px;
  }

  main {
    margin-left: 20px;
  }
}