svg .axis line, svg .axis path {
    fill: none;
    stroke: black;
    shape-rendering: crispEdges;
}
svg .ticks text {
    fill: black;
}

svg path.plot {
    fill: none;
    stroke: blue;
}

svg circle.scatter {
    stroke: black;
    stroke-width: 3;
    fill: none;
}