滚动条样式

::-webkit-scrollbar-track-piece {
    background: #efefef;
}
::-webkit-scrollbar {
    width: 10px;
    height: 6px;
}
::-webkit-scrollbar-thumb {
    height: 20px;
    border-radius: 10px;
    background-color: #555;
}
::-webkit-scrollbar-thumb:hover {
    background-color: #555;
}