如何调整滚动条的样式

非标准
该特性是非标准的，请尽量不要在生产环境中使用它！

描述

这个 ::-webkit-scrollbar CSS伪类选择器影响了一个元素的滚动条的样式

::-webkit-scrollbar 仅仅在支持WebKit的浏览器 (例如, 谷歌Chrome, 苹果Safari)可以使用.

CSS滚动条选择器

你可以使用以下伪元素选择器去修改各式webkit浏览器的滚动条样式:

• ::-webkit-scrollbar — 整个滚动条.
• ::-webkit-scrollbar-button — 滚动条上的按钮 (上下箭头).
• ::-webkit-scrollbar-thumb — 滚动条上的滚动滑块.
• ::-webkit-scrollbar-track — 滚动条轨道.
• ::-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交汇的部分.
• ::-webkit-resizer — 某些元素的corner部分的部分样式(例:textarea的可拖动按钮).

语法

::-webkit-scrollbar { styles here }

例子

.visible-scrollbar, .invisible-scrollbar, .mostly-customized-scrollbar {
  display: block;
   10em;
  overflow: auto;
  height: 2em;
}
.invisible-scrollbar::-webkit-scrollbar {
  display: none;
}

/* Demonstrate a "mostly customized" scrollbar
 * (won't be visible otherwise if width/height is specified) */
.mostly-customized-scrollbar::-webkit-scrollbar {
   5px;
  height: 8px;
  background-color: #aaa; /* or add it to the track */
}
/* Add a thumb */
.mostly-customized-scrollbar::-webkit-scrollbar-thumb {
    background: #000; 
}
<div class="visible-scrollbar">Thisisaveeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeerylongword</div>
<div class="invisible-scrollbar">Thisisaveeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeerylongword</div>
<div class="mostly-customized-scrollbar">Thisisaveeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeerylongword<br>
And pretty tall<br>
thing with weird scrollbars.<br>
Who thought scrollbars could be made weeeeird?</div>

参考：https://developer.mozilla.org/zh-CN/docs/Web/CSS/::-webkit-scrollbar