.gdtCont {
width:200px;
height:300px;
border:1px solid #ccc;
overflow:hidden;
margin:0 auto;
position:relative;
}
.txtCont {
width:220px;
height:100%;
overflow:auto;
box-sizing:border-box;
padding-left:20px;
}
.bz-gdtCon {
width:6px;
position:absolute;
top:0;
right:0;
background:rgba(0,0,0,.5);
height:100%;
display:none;
}
.bz-chtgn {
width:100%;
position:absolute;
top:0;
left:0;
background:rgba(255,255,255,.5);
}
自定义滚动条,关键是在计算滚动条比例上