.axis
{
    font-size: 12px;
}

    .axis path,
    .axis line
    {
        fill: none;
        stroke: #CCC;
        stroke-width: 2;
        shape-rendering: crispEdges;
    }

.x.axis path
{
    stroke: #CCC;
}

.line
{
    transition: fill .3s ease;
}

    .line:hover,
    .line:focus
    {
        opacity: 0.5;
    }