index.css

.popover {
    display: none;
    position: absolute;
    z-index: 99999;
    width: 400px;
    padding: 10px;
    background: #EEEFEB;
    color: #000000;
    border: 1px solid #4D4F53;
    margin: 0px;
    -webkit-box-shadow: 0px 0px 5px 0px rgba(164, 164, 164, 1);
    box-shadow: 0px 0px 5px 0px rgba(164, 164, 164, 1);
}
.popover h2
{
    background-color: #4D4F53;
    color:  #E3E5DD;
    font-size: 14px;
    display: block;
    width: 100%;
    margin: -10px 0px 8px -10px;
    padding: 5px 10px;
}

#chart {
    margin-top: 50px;
}

#legend {
    padding: 1.5em 0 0 1.5em;
}

#title {
    font-size: 200%;
    text-align: center;
}

ul {
    margin-left: 5%;
}

li.key {
    display: inline;
    border-top-width: 15px;
    border-top-style: solid;
    width: 10%;
    padding-left: 0;
    padding-right: 0;
    font-weight: 550;
}