王新阳

参考：
https://www.cnblogs.com/ranyonsue/p/9487599.html
https://www.jianshu.com/p/c2addb233acd

.box::-webkit-scrollbar{
  width: 4px;
  height: 1px;
}
.box::-webkit-scrollbar-thumb{
  border-radius: 4px;
  -webkit-box-shadow: inset 0 0 5px rgba(0, 0, 0, 0.2);
  background: #555;
}
.box::-webkit-scrollbar-track{
  -webkit-box-shadow: inset 0 0 5px rgba(0, 0, 0, 0.2);
  border-radius: 4px;
  background: #eee;
}