<div class="container">
  
 <p>使用 ul li 製作下拉選單</p>
  <div class="drop">
    <div class="dropOption">
      <span>請選擇</span>
    </div>

    <ul class="dropdown">
      <li>選項 1</li>
      <li>選項 2</li>
      <li>選項 3</li>
      <li>選項 4</li>
      <li>選項 5</li>
      <li>選項 6</li>
      <li>選項 7</li>
      <li>選項 8</li>
    </ul>
  </div>
</div>
.container{
  padding: 1rem;
}
p {
  font-size: 24px;
  font-weight: bold;
  color: orange;
}

.drop {
  position: relative;
  display: block;
  width: 100%;
  margin: 0 0 10px;
  &:hover {
    .dropOption {
      display: block;
    }
  }
  &:hover {
    .dropdown {
      display: block;
    }
  }
  &:hover {
    .dropdown.close {
      display: none;
    }
  }
  .dropOption {
    position: relative;
    width: auto;
    color: #666;
    font-size: 20px;
    background-color: #fff;
    padding: 10px;
    border: 1px solid #888;
    border-radius: 5px;
    box-sizing: border-box;
    cursor: pointer;
    &::after {
      content: "";
      position: absolute;
      top: 20px;
      right: 12px;
      border-width: 8px 6px;
      border-style: solid;
      border-color: #999 transparent transparent transparent;
    }
  }
  .dropdown {
    display: none;
    width: 100%;
    max-height: 350px;
    position: absolute;
    color: #333;
    padding: 0;
    margin: 0;
    background-color: #f9f9f9;
    box-shadow: 0px 2px 3px 0px #ccc;
    border-radius: 6px;
    box-sizing: border-box;
    overflow: auto;
    z-index: 10;
    > li {
      display: block;
      color: #000;
      padding: 12px;
      font-size: 20px;
      margin: 0 10px;
      cursor: pointer;
      &:first-child {
        margin: 10px;
      }
      &:last-child {
        margin-bottom: 10px;
      }
      &:hover {
        background-color: orange;
        border-radius: 6px;
      }
    }
    &::-webkit-scrollbar {
      width: 15px;
    }
    &::-webkit-scrollbar-track {
      background-color: #eee;
      border-radius: 6px;
    }
    &::-webkit-scrollbar-thumb {
      background-color: orange;
      border-radius: 15px;
    }
    &::-webkit-scrollbar-button {
      background-color: #f9f9f9;
    }
  }
}
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