body {
  background-color: white;
}

#navbar {
  position: fixed;
  min-width: 250px;
  left: 0px;
  width: 300px;
  height: 100%;
  border-right: 1px solid;
  border-color: rgba(0, 25, 200, 0.5);
}

#navbar header {
  text-align: center;
}

#navbar ul {
  height: 80%;
  padding: 0;
}

#navbar li {
  position: relative;
  list-style: none;
  border-top: 1px solid;
  color: red;
}

.main-section header {
  font-size: 40px
}

#main-doc {
  position: absolute;
  margin-left: 310px;
  padding: 20px;
}

@media (max-width: 650px) {
  #navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: white;
    z-index: 1;
    max-height: 150px;
  }

  #navbar ul {
    background-color: white; 
  }

  #main-doc {
    position: relative;
    margin-left: 0px;
    margin-top: 200px;
  }
}