首先要知道，修改滚动条样式，利用伪元素-webkit-scrollbar。

注意， ::-webkit-scrollbar仅仅支持WebKit的浏览器(例如谷歌Chrome、苹果Safari)。

其次还需要了解滚动条的一些组成：

• ::-webkit-scrollbar 滚动条整体部分，可以设置宽度等
• ::-webkit-scrollbar-thumb 滚动条里面的滑块
• ::-webkit-scrollbar-button 滚动条轨道两端的按钮，允许通过点击以微调滑块的位置
• ::-webkit-scrollbar-track 滚动条的轨道(里面装有thumb)
• ::-webkit-scrollbar-track-piece 滚动条没有滑块的轨道部分
• ::-webkit-scrollbar-corner 当同时有垂直滚动条和水平滚动条时的交汇处
• ::-webkit-resizer 某些元素的corner部分(如textarea的可拖动按钮)
  

对此有了一些了解之后就可以上手滚动条样式的修改了。

代码实现：

<ul class="nav-tabs-scroll">
  <li v-for="(item,index) in tabs" :key="index" class="nav-item-scroll">{
<!-- -->{item.text}}</li>
</ul>
<v-textarea outlined v-model="text" style="width: 200px; margin: 16px;" class="text"></v-textarea>

data: () => ({
      tabs: [
        { value: 4001, text: 'Loan Log', code: 'LOAN_LOG' },
        { value: 4002, text: 'Document Log', code: 'DOCUMENT_LOG' },
        { value: 4003, text: 'Note Log', code: 'NOTE_LOG' },
        { value: 4004, text: 'Operation Log', code: 'OPERATION_LOG' },
        { value: 4005, text: 'Payment Log', code: 'PAYMENT_LOG' },
        { value: 4006, text: 'Maintenance Log', code: 'MAINTENANCE_LOG' },
        { value: 4007, text: 'Transaction Log', code: 'TRANSACTION_LOG' },
        { value: 4008, text: 'Collection Log', code: 'COLLECTION_LOG' },
        { value: 4001, text: 'Loan Log', code: 'LOAN_LOG' },
        { value: 4002, text: 'Document Log', code: 'DOCUMENT_LOG' },
        { value: 4003, text: 'Note Log', code: 'NOTE_LOG' },
        { value: 4004, text: 'Operation Log', code: 'OPERATION_LOG' },
        { value: 4005, text: 'Payment Log', code: 'PAYMENT_LOG' },
        { value: 4006, text: 'Maintenance Log', code: 'MAINTENANCE_LOG' },
        { value: 4007, text: 'Transaction Log', code: 'TRANSACTION_LOG' },
        { value: 4008, text: 'Collection Log', code: 'COLLECTION_LOG' },
        { value: 4001, text: 'Loan Log', code: 'LOAN_LOG' },
        { value: 4002, text: 'Document Log', code: 'DOCUMENT_LOG' },
        { value: 4003, text: 'Note Log', code: 'NOTE_LOG' },
        { value: 4004, text: 'Operation Log', code: 'OPERATION_LOG' },
        { value: 4005, text: 'Payment Log', code: 'PAYMENT_LOG' },
        { value: 4006, text: 'Maintenance Log', code: 'MAINTENANCE_LOG' },
        { value: 4007, text: 'Transaction Log', code: 'TRANSACTION_LOG' },
        { value: 4008, text: 'Collection Log', code: 'COLLECTION_LOG' }
      ],
      text: ''
    }),

<style lang="scss" scoped>
  .nav-tabs-scroll {
    height: 100px;
    list-style: none;
    margin: 0px;
    padding: 16px 0;
    overflow-x: auto;
    display: inline-block;
    white-space: nowrap;
    width: 100%; 
    background: #F9FAFD;
  }
  .nav-item-scroll {
    background: #E5F0FF;
    color: #24252E;
    font-size: 12px;
    font-weight: 400;
    line-height: 16px;
    padding: 8px 8px 180px;
    text-align: center;
    display: inline;
    margin: 0 4px 0;
    border-radius: 16px;
  }
  .nav-tabs-scroll::-webkit-scrollbar {
    width: 20px;
    height: 10px;
  }
  .nav-tabs-scroll::-webkit-scrollbar-thumb {
    border-radius: 5px;
    background: red;
  }
  .nav-tabs-scroll::-webkit-scrollbar-button {
    width: 10px;
    border-radius: 50%;
    background: black;
  }
  .nav-tabs-scroll::-webkit-scrollbar-track {
    box-shadow: inset 0 0 2px #333;
    border-radius: 5px;
    background: blue;
  }
  .nav-tabs-scroll::-webkit-scrollbar-corner {
    background: springgreen;
  }
  /*
  .nav-tabs-scroll::-webkit-scrollbar-track-piece {
    box-shadow: inset 0 0 2px #333;
    border-radius: 5px;
    background: plum;
  }
  */
</style>
<style>
  .text.v-textarea textarea::-webkit-resizer {
    background: pink;
  }
</style>

默认的样式：

修改后的样式：