body {
  font-family:'Times New Roman', serif
}



.sidenav {
  height: 30%;
  width: 160px;
  position: fixed;
  z-index: 1;
  top: 90;
  left: 20;
  background-color: #D1BEB0;
  overflow-x: hidden;
  padding-top: 20px;
  border-style: inset;
  border-width: 5px;
}

.sidenav a {
  padding: 6px 8px 6px 16px;
  text-decoration: none;
  font-size: 25px;
  color: #818181;
  display: block;
}

.sidenav a:hover {
  color: #f1f1f1;
}

.main {
  margin-top: 15px;
  margin-left: 190px;
  font-size: 25px; /* font size */
  padding: 5px 50px;
  background-color: #D1BEB0;
  border-style: inset;
  border-width: 5px;
}

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

.center {
  display: block;
  margin-left: auto;
  margin-right: auto;
  width: 50%;
  
}