svg rect:hover {
    stroke: rgba(51, 51, 51, 0.05);
}

body {
    text-align: center;
    font: 10px sans-serif;
}

.heat:hover {
    stroke: #000;
}

hoverTip {
    width: 75px;
    height: 72px;
    border: 1px solid #ccc;
    border-radius: 3px;
    background: #f9f8f8;
    padding: 5px;
    text-align: center;
    display: none;
}

.axis path,
.axis line {
    fill: none;
    stroke: #000;
    shape-rendering: crispEdges;
}


.block {
    width: 250px;
    display: block;
    background: #ccc;
    padding: 10px;
    font-size: 1.5em;
}

.box {
    width: 1250px;
    margin: 10px auto;
    box-shadow: 2px 2px 5px 0px #333;
    background: #fff;
}