*{
  box-sizing: border-box;
}

body{
  font-family: 'Open Sans', Arial, sans-serif;
  margin: 0;
}

.container{
  padding-right: 2rem ;
  border-top: 3px gray solid;
}

.nav-bar hr{
  width: 100%;
}

.main-body h2{
  padding: 0 1.5rem;
}

.header{
  position: fixed;
  width: 300px;
  height: 60px;
  padding: 10px 0.5rem 0 2rem;
  border-right: 3px gray solid;
  margin: 0;
}

article{
  text-align: justify;  /* for text align use all text till the edge*/
  padding: 0 0.5rem 0 2.5rem;
}

.nav-bar{
  position: fixed;
  top: 60px;
  width: 300px;
  height: 90%;
  border-right: 3px gray solid;
  overflow: auto;
  padding-bottom: 1rem;
}

.nav-bar a{
  display: block;
  padding: 0.15rem 0.5rem 0.15rem 2rem;
  text-decoration: none;
  opacity: 0.7;
  color: black;
}

.nav-bar a:hover {
  opacity: 1;
}

.main-body{
  margin-left: 300px;
  padding-top: 12px ;
}

li{
  padding-bottom: 10px;
}

.main-body code{
  display: block;
  width: 99%;
  height: auto;
  background-color: #f7f7f7;
  padding: 10px;
  white-space: pre-line;
  margin-left: 10px;
  /* word-break: normal;
    word-wrap: normal; */
}

@media (max-width: 800px) {
  .container{
    padding: 0;
  }

  .main-body{
    margin-left: 0;
    width: 100%;
  }

  article{
    padding-right: 2rem;
  }

  .header{
    width: 100%;
    position: static;
    border: 0;
    text-align: center;
  }
  .nav-bar {
    position: static;
    width: 100%;
    height: 200px;
    overflow: auto;
    border: 3px gray solid;
  }

  .scroll hr:first-child{
    border-style: none;
  }
}