body {
  background-color: black;
  color: yellow;
  font-family: Verdana;
  text-align: center;
}
ul {
  list-style-type: none;
  background-color: #6924bd;
  padding: 0;
  margin: 0;
  overflow: hidden;
  margin-left: 25%;
  margin-right: 25%;
  border-radius: 25px;
  display: flex;
  justify-content: center;
}
ul li a {
  color:  white;
  text-decoration: none;
  padding: 15px;
  display: block;
  text-align: center;
}
ul a:hover {
  background-color: black;
}
ul li {
  float: left;
}