/*定义滚动条高宽及背景 高宽分别对应横竖滚动条的尺寸*/ 
::-webkit-scrollbar {
    width: 9px;
    height: 9px
}
/*定义滚动条轨道*/ 
::-webkit-scrollbar-track {
    background-color: transparent;
    -webkit-border-radius: 2em;
    -moz-border-radius: 2em;
    border-radius: 2em
}
/*定义滑块 内阴影+圆角*/ 
::-webkit-scrollbar-thumb {
    background-color: #0093ff;
    background-image: -webkit-linear-gradient(45deg,rgba(255,255,255,.4) 25%,transparent 25%,transparent 50%,rgba(255,255,255,.4) 50%,rgba(255,255,255,.4) 75%,transparent 75%,transparent);
    -webkit-border-radius: 2em;
    -moz-border-radius: 2em;
    border-radius: 2em
}