body {
  font-family: "Helvetica Neue", Helvetica, sans-serif;
  margin: 0 auto 4em auto;
  tab-size: 2;
  -webkit-text-size-adjust: none;
}

.pixel {
    fill: #DDD;
}

.cell {
    fill: black;
}

.line {
    fill: none;
    stroke: steelblue;
}

.grid line {
  stroke: lightgrey;
  stroke-opacity: 0.7;
  shape-rendering: crispEdges;
}

.grid .domain {
    opacity: 0;
}

h1 {
    font-family: "Helvetica Neue", Helvetica, sans-serif;
    font-size: 46px;
    font-weight: 500;
    letter-spacing: -1px;
    margin: 0.1em 0;
}

.column {
    max-width: 960px;
    position: relative;
    display: block;
    margin: 0 auto;
    padding: 0 10px;
}