<ul class="menu-list">
  <li class="menu-item">Menu 1</li>
  <li class="menu-item">Menu 2</li>
  <li class="menu-item">Menu 3</li>
  <li class="menu-item">Menu 4</li>
  <li class="menu-item">Menu 5</li>
  <li class="menu-item">Menu 6</li>
  <li class="menu-item">Menu 7</li>
  <li class="menu-item">Menu 8</li>
</ul>

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
  display: -webkit-box;
  display: -ms-flexbox;
  display: -moz-box;
  display: box;
  -webkit-box-pack: center;
  -webkit-box-orient: vertical;
  -moz-box-pack: center;
  -moz-box-orient: vertical;
  -ms-flex-pack: center;
  -ms-flex-direction: column;
  box-pack: center;
  box-orient: vertical;
}
ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
.menu-list {
  display: flex;
  font-size: 18px;
}
.menu-list .menu-item {
  width: 100%;
  text-align: center;
  padding: 10px;
  cursor: pointer;
  background-color: rgb(230, 230, 250);
}
.menu-list:hover .menu-item:not(:hover) {
  background-color: skyblue;
}