div.hoverbox {
    position: absolute;
    z-index: 1;
    background-color: #ffffcc;
    padding: 2px;
    overflow: hidden;
    border: 1px solid black;
    font-size: 9pt;
}

div.hoverbox img.pwlgraph {
    width: 400px;
    height: 150px;
    margin-top: 5px;
}
  
#legend {
    background-color: white;
    border: 1px solid black;
    font-family: sans-serif;
    font-size: 10pt;
}
#legend span {
    font-family: sans-serif;
    font-size: 10pt;
    padding: 3px;
}

#legend img {
    text-align: center;
    padding: 3px;
}