.vertical-brush .area {
    fill: steelblue;
}

.vertical-brush .axis path,
.vertical-brush .axis line {
    fill: none;
    stroke: #f6f6f6;
    shape-rendering: crispEdges;
}

.vertical-brush .brush .extent {
    stroke: #fff;
    fill-opacity: .125;
    shape-rendering: crispEdges;
}