Html CSS：如何更改webkit中滚动条右下角正方形的颜色？

问题:

如何在webkit（Google Chrome）中更改滚动条右下角的颜色（变为黑色）

这就是我到目前为止所做的：

/*
http://www.coffeepowered.net/2011/06/17/sexy-css-scrollbars/
http://css-tricks.com/custom-scrollbars-in-webkit/
*/
::-webkit-scrollbar {
    width: 13px;
    height: 13px; }

::-webkit-scrollbar:hover {
    height: 18px; }

::-webkit-scrollbar-button:start:decrement,
::-webkit-scrollbar-button:end:increment 
{
    height: 15px;
    width: 13px;
    display: block;
    background: #101211;
    background-repeat: no-repeat; 
}

::-webkit-scrollbar-button:horizontal:decrement 
{
    background-image: url(./images/horizontal-decrement-arrow.png);
    background-position: 4px 3px; 
}

::-webkit-scrollbar-button:horizontal:increment 
{
    background-image: url(./images/horizontal-increment-arrow.png);
    background-position: 3px 3px; 
}

::-webkit-scrollbar-button:vertical:decrement 
{
    background-image: url(./images/vertical-decrement-arrow.png);
    background-position: 3px 4px; 
}

::-webkit-scrollbar-button:vertical:increment 
{
    background-image: url(./images/vertical-increment-arrow.png);
    background-position: 3px 4px; 
}

::-webkit-scrollbar-button:horizontal:decrement:active { background-image: url(./images/horizontal-decrement-arrow-active.png); }

::-webkit-scrollbar-button:horizontal:increment:active { background-image: url(./images/horizontal-increment-arrow-active.png); }

::-webkit-scrollbar-button:vertical:decrement:active { background-image: url(./images/vertical-decrement-arrow-active.png); }

::-webkit-scrollbar-button:vertical:increment:active { background-image: url(./images/vertical-increment-arrow-active.png); }


::-webkit-scrollbar-track 
{
    -webkit-box-shadow: inset 0 0 6px rgba(0,0,0,0.3); 
    border-radius: 10px;
}

::-webkit-scrollbar-track-piece {
    background-color: #151716; }

::-webkit-scrollbar-thumb:vertical 
{
    height: 50px;
    background: -webkit-gradient(linear, left top, right top, color-stop(0%, #4d4d4d), color-stop(100%, #333333));
    border: 1px solid #0d0d0d;
    border-top: 1px solid #666666;
    border-left: 1px solid #666666; 
    border-radius: 10px;
    -webkit-box-shadow: inset 0 0 6px rgba(0,0,0,0.5); 
}

::-webkit-scrollbar-thumb:horizontal 
{
    width: 50px;
    background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #4d4d4d), color-stop(100%, #333333));
    border: 1px solid #1f1f1f;
    border-top: 1px solid #666666;
    border-left: 1px solid #666666; 
    border-radius: 10px;
    -webkit-box-shadow: inset 0 0 6px rgba(0,0,0,0.5); 
}

啊，没关系：

找到答案

---

我看到左边有一个滚动条，上面有一个滚动条，但正方形不是滚动条的一部分。@斯塔克：是的，但不是拇指的。这是角落。这不只是背景吗？@stark:不，绝对不是。框架背景设置为灰色。感谢您回答自己的问题。确实为我节省了不少时间。@Jeremy Chone:谢谢你的确认，我想是的；）

::-webkit-scrollbar-corner {
/*
background-image: url(resources/corner.png);
background-repeat: no-repeat;
*/
background-color: #3D3D3D;
}