h1 {
color: orange;
text-align: center;
}
ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  width: 150;
background-color: #3d3d3d;
font-size: 30px;
  border: none;
  position: fixed;
  height: 100%;
  overflow: auto;
}
li {
   border: none;
  background-color: blue;
font-size: 20px;
}


li a {
  display: block;
  color: #0000CC;
  padding: 8px 16px;
  text-decoration: none;
}

li .active {
  background-color: #0099ff;
  color: white;
}

li a:hover:not(.active) {
  background-color: black;
  color: white;
}