style.css

ul{
  position: fixed;
  top: 50%;
  left: 0;
  transform: translateY(50%);
  margin: 0;
  padding: 0;
  z-index: 1; 
}
ul li{
  list-style: none;
}
#container{
  width: 100%;
  height: 100vh;
}
#container div{
  position: relative;
  width: 100%;
  height: 100%;
}
 
#container div h1{
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 100%;
  text-align: center;
  text-transform: uppercase; 
  margin: 0;
  padding: 0;
  font-size: 8rem;
  color: #fff;
}
ul li a{
  display: block;
  text-decoration: none;
  height: 30px;
  font-size: 24px;
  background: #fff;
  width: 155px;
  color: #262626;
  margin: 4px 0;
  padding-left: 15px;
  text-transform: uppercase;
  border-top-right-radius: 15px;
  border-bottom-right-radius: 15px;
  line-height:30px;
}
ul li a:hover{
  background: #333;
  text-decoration: none;
  color: #fff;
}
#container{
  width: 100%;
  height: 100vh;
  scroll-behavior: smooth;
  overflow-Y: scroll;
}
#container div#cambridge{
  background-color: #00ced1;
}
#container div#it{
  background-color: skyblue;
}
#container div#institute{
  background-color: peachpuff;
}
#container div#dot{
  background-color: #2bb673;
}
#container div#com{
  background-color: #c72339;
}