.yyui-fixedside{
    display: block;
    background-color:#2f323a;
    position: fixed;
    width: 50px;
    height: 50px;
}
.yyui-fixedside.left{
    height: 100%;
    top:0;
    left: 0;
}
.yyui-fixedside.right{
    height: 100%;
    top:0;
    right: 0;
}
.yyui-fixedside.top{
    width: 100%;
    top:0;
    left: 0;
}
.yyui-fixedside.bottom{
    width: 100%;
    bottom:0;
    right: 0;
}