body {
  background-color: lavender;
  background-image: url("stars.gif");
}
ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: #400E63;
  display: flex;
  justify-content: center;
  border-radius: 100px;
}

ul li {
  float: left;
}

ul li a {
  display: block;
  color: #B6F487;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

ul li a:hover {
  background-color: skyblue;
}