.lines {
  fill: none;
  stroke-width: 1.5px;
}
.lines:hover {
  stroke: #f00;
}
.axis path {
  stroke-width: 1px;
  stroke: #808080;
  fill: none;
}
.axis line {
  fill: none;
  stroke: #808080;
  shape-rendering: crispEdges;
}