.sidenav {
  height: 100%;
  width: 20%;
  position: fixed;
  z-index: 1;
  top: 0; 
  left: 0;
  background-color: #111; /* Black */
  overflow-x: hidden; 
  padding-top: 20px;
}
 
.sidenav ul {
  padding-left: 0;
  margin-left: 0; 
}

.sidenav ul ul {
  padding-left: 15px;
}
.sidenav a {
  padding: 6px 8px 6px 16px;
  text-decoration: none;
  font-size: 0.8rem;
  color: #818181;
  display: block;
}
  
.sidenav a:hover {
  color: #f1f1f1;
}
  
.sidenav .closebtn {
  position: absolute;
  top: 0;
  right: 25px;
  font-size: 36px;
  margin-left: 50px;
}

@media screen and (max-height: 450px) {
  .sidenav {padding-top: 15px;}
  .sidenav a {font-size: 18px;}
}