style.css

@import url("https://fonts.googleapis.com/css2?family=Rubik&display=swap");

html,
body {
  font-family: Rubik;

  font-size: 16px;
  background-color: #f9fafc;
  line-height: 1.8em;
}

#nav-bar {
  position: fixed;
  top: 0px;
  left: 0px;
  width: 36%;
  height: 100%;
  padding-top: 40px;
  background-color: #121212;
  color: #ffffff;
}

#main-doc {
  position: absolute;
  margin-left: 36%;
  color: #1d2035;
  padding-left: 20px;
  margin-right: 40px;
}

/*for Tablets and Mobile Screen*/
@media only screen and (max-width: 800px) {
  #nav-bar {
    position: absolute;
    width: 100%;
    height: 40vh;
    padding-bottom: 20px;
    z-index: 10;
  }

  #main-doc {
    position: relative;

    margin-top: 50vh;
    margin-left: 10px;
    margin-right: 10px;
    padding-left: 10px;
    padding-right: 10px;
  }
}

#nav-bar header {
  font-size: 1.4em;
  margin-left: 40px;
}

#nav-bar li {
  list-style: none;
  font-size: 1em;
  line-height: 2.4em;
}

#main-doc header {
  font-size: 1.2em;
}

.main-section {
  margin-top: 20px;
  padding-top: 20px;
}
.nav-link {
  color: #d3d7e4;
  text-decoration: none;
  list-style: none;
  margin-bottom: 80px;
}