styles.css

body {
    font-family: "Helvetica Neue", "Roboto", sans-serif;
    font-size: 12px;
    background-color: #33333f;
    margin: 0 auto 0 auto;
    padding: 0;
    width: 840px;
}
.allcontent {
    background-color: white;
}
.box {
    display: block;
    background-color: #f0f0fb;
}
.subbox {
    padding: 0em 1em;
    width: 250px;
}
.header {
    font-size: 11pt;
    background-color: #d0d0e5;
}
input {
    font-family: "Helvetica Neue", "Roboto", sans-serif;
}
select {
    font-family: "Helvetica Neue", "Roboto", sans-serif;
}
#freqrange {
    background-color: #f0f0fb;
}
#circle circle {
    fill: none;
    pointer-events: all;
}
.circlechart {
    margin: 0 auto 0 auto;
    width: 700px;
}
.barchart {
    margin-left: 30px;
}
path.chord {
    stroke: #000;
    stroke-width: .25px;
    transition: opacity 0.2s;
}
#circle:hover path.fade {
    opacity: 0.075;
}

.bar {
    fill: darkgray;
}

.bar:hover {
    fill: brown;
}

.axis {
    font-family: "Helvetica Neue", "Roboto", sans-serif;
    font-size: 11px;
}

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

.axis text {
    font-family: "Helvetica Neue", "Roboto", sans-serif;
    font-size: 11px;
    color: darkgray;
}

.x.axis path {
    display: none;
}

/* fromhttp://bl.ocks.org/Caged/6476579 */
/* Creates a small triangle extender for the tooltip */


.d3-tip {
    line-height: 1;
    font-weight: bold;
    padding: 12px;
    background: rgba(0, 0, 0, 0.8);
    color: #fff;
    border-radius: 2px;
}

/* Creates a small triangle extender for the tooltip */
.d3-tip:after {
    box-sizing: border-box;
    display: inline;
    font-size: 10px;
    width: 100%;
    line-height: 1;
    color: rgba(0, 0, 0, 0.8);
    content: "\25BC";
    position: absolute;
    text-align: center;
}

/* Style northward tooltips differently */
.d3-tip.n:after {
    margin: -1px 0 0 0;
    top: 100%;
    left: 0;
}

.fd-zone {
    position: relative;
    overflow: hidden;
    width: 15em;
    margin: 0 auto;
    text-align: center;
}

.fd-file {
    opacity: 0;
    font-size: 118px;
    position: absolute;
    right: 0;
    top: 0;
    z-index: 1;
    padding: 0;
    margin: 0;
    cursor: pointer;
    filter: alpha(opacity=0);
    font-family: sans-serif;
}

.fd-zone.over { border-color: maroon; background: #eee; }