body{
  background: #f1f1f1;
  font-family: arial;
}
ul {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: white;
  box-shadow: 0px 0px 5px 5px #e7e7e7;
}

li {
  float: left;
}

li a {
  display: block;
  color: black;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

li a:hover {
  padding: 13px 15px;
  border-radius: 10%;
  border: 1px solid #15768d;
  box-shadow: 0px 0px 2px 2px lightgray;
}
.active{
  background-color: #a6bde7;
}