body {
    background-color: #222;
}
h1, h2, p, label {
    color: #efefef;
}
#infected-count {
    color: darkorange;
}
#healthy-count {
    color: darkseagreen;
}
#controls {
    text-align: center;
}
.control {
    margin: 20px 10px 10px 10px;
}
svg {
    background-color: #fff;
}