修改滚动条样式，加粗滚动条

::-webkit-scrollbar{ /*滚动条基本样式，高度*/
width:10px;height:10px;
}
::-webkit-scrollbar-thumb {/*滚动条上层颜色*/
border-radius: 5px;
-webkit-box-shadow: inset 0 0 5px rgba(0,0,0,0.2);
background: rgba(0,0,0,0.2);
}
::-webkit-scrollbar-track {/*滚动条底层颜色*/
-webkit-box-shadow: inset 0 0 5px rgba(0,0,0,0.2);
border-radius: 0;
background: rgba(0,0,0,0.1);
}