<div class="cp_navi02">
<ul>
  <li><a href="#home" class="active">Home</a></li>
  <li><a href="#news">News</a></li>
  <li><a href="#contact">Contact</a></li>
  <li><a href="#about">About</a></li>
</ul>
</div>

.cp_navi02 ul {
  display: flex;
  flex-flow: row;
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: #1b2538;
}
.cp_navi02 li {
  border-right: 1px solid #bbbbbb;
}
/*最後の項目のみ右に寄せる*/
.cp_navi02 li:last-child {
  border-right: none;
  margin-left: auto;
}
.cp_navi02 li a {
  display: block;
  color: #ffffff;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
  transition: all .3s;
}
.cp_navi02 li a:hover:not(.active) {
  background-color: #a9bce2;
}
.cp_navi02 .active {
  background-color: #da3c41;
}