.hull{
    opacity: 0.2;
    stroke-width: 20px;
}

div.tooltip {
    position: absolute;
    text-align: center;
    width: 300px;
    height: auto;
    padding: 5px;
    font: 14px sans-serif;
    background: black;
    color: white;
    border: 0px;
    border-radius: 8px;
    pointer-events: none;
}