style.css

body {
  margin: 35px;
}
header {
  font-size: 28px;
  margin-top: 20px;
}
li {
  line-height: 1.4;
  padding: 7px;
  margin-left: 40px;
}
.codeCase {
  background-color: lightgrey;
  font-size: 12px;
  padding: 15px;
  margin: 20px;
  line-height: 1.6;
  border-radius: 8px;
}
#main-doc {
  margin-left: 300px;
  padding: 1px 16px;
  height: 1000px;
}
#navbar {
  top: 0px;
  margin: 0px;
  left: 0px;
  width: 300px;
  background-color: #f1f1f1;
  position: fixed;
  height: 100%;
  overflow: auto;
}
#navbar a {
  color: black;
  padding: 0px;
  text-align: justify;
  font-size: 20px;
  text-decoration: none;
}
.nav-link li {
  border: 1px;
  padding: 5px;
  padding-left: 30px;
  list-style: none;
  position: relative;
  left: -50px;
  width: 100%;
}
P {
  font-size: 16px;
  text-align: justify;
  line-height: 20px;
}
.pic {
  width: 50px;
  height: 50px;
  align-items: baseline;
}
#footer {
  height: 40px;
  width: 300px;
  position: fixed;
  left: 20px;
  bottom: 40px;
}
#copyright {
  text-align: center;
}
@media screen and (max-width: 700px) {
  #navbar {
    width: 100%;
    height: auto;
    position: relative;
  }
  .navbar a {
    float: left;
  }
  div.main-doc {
    margin-left: 0;
  }
}

@media screen and (max-width: 350px) {
  .navbar a {
    text-align: center;
    float: none;
  }
}