#bubble { width:400px;
    font-family:Verdana;
    font-size:x-small;
}

#legend {
    font-family: Arial, sans-serif;
    background: #fff;
    padding: 10px;
    margin: 10px;
    border: 0px solid #000;
    height: 200px;
    overflow: auto;
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
    visibility: hidden;
}
#legend h3 {
    margin-top: 0;
}
#legend img {
    vertical-align: middle;
}