<div class="cp_navi06">
<ul>
  <li><a href="#">Home</a></li>
  <li>
    <a href="#" class="caret">Products</a>
      <ul>
        <li><a href="#cat">cat</a></li>
        <li><a href="#dog">dog</a></li>
        <li><a href="#rabbit">rabbit</a></li>
      </ul>
  </li>
  <li><a href="#">About</a></li>
  <li><a href="#">Help</a></li>
</ul>
</div>

.cp_navi06 {
  background-color: #ffffff;
  border: 1px solid #dedede;
  border-radius: 4px;
  box-shadow: 0 2px 2px -1px rgba(0, 0, 0, 0.055);
  color: #888888;
  display: block;
  margin: 1em auto;
  overflow: hidden;
  width: 100%;
}
.cp_navi06 ul {
  display: flex;
  margin: 0;
  padding: 0;
}
.cp_navi06 ul li {
  list-style-type: none;
  transition: all 0.3s;
}
.cp_navi06 ul li a.caret {
  display: flex;
  align-items: center;
}
.cp_navi06 ul li a.caret::after {
  content: '';
  background: #aaaaaa;
  width: 10px;
  height: 5px;
  clip-path: polygon(50% 100%, 0 0, 100% 0);
  transition: color 0.1s linear;
}
.cp_navi06 ul li a {
  color: #aaaaaa;
  display: block;
  line-height: 56px;
  padding: 0 10px;
  text-decoration: none;
}
.cp_navi06 ul li:hover {
  background-color: rgb(218, 60, 65);
}
.cp_navi06 ul li:hover a {
  color: #ffffff;
}
.cp_navi06 ul li:hover a.caret::after {
  background: #ffffff;
}
/*下層に隠れたメニューの動き*/
.cp_navi06 ul li ul {
  background-color: rgb(218, 60, 65);
  border-top: 0;
  border-radius: 0 0 4px 4px;
  box-shadow: 0 2px 2px -1px rgba(0, 0, 0, 0.055);
  display: none;
  margin: 0;
  opacity: 0;
  position: absolute;
  width: 165px;
  visibility: hidden;
  transition: all 0.3s;
}
.cp_navi06 ul li:hover ul {
  display: block;
  opacity: 1;
  visibility: visible;
}
.cp_navi06 ul li ul li {
  border-radius: 0 0 4px 4px;
}
.cp_navi06 ul li ul li a {
  color: #ffffff;
}
.cp_navi06 ul li ul li:hover a {
  background-color: rgba( 255, 255, 255, 0.1);
}