style.css

body {
    margin: 25px;
    font-family: Helvetica, Arial, sans-serif;
}

.tooltip {
    font-weight: bold;
    padding: 0.5rem;
    border: 1px solid silver;
    color: #222;
    background: #fff;
    border-radius: 5px;
    box-shadow: 0px 0px 5px 0px #a6a6a6;
    opacity: 0.9;
    position: absolute;
    font-size: 1.5rem;
}

.hidden {
    display: none;
}

#details,
#initial {
    margin-top: 2rem;
}

table {
    margin-bottom: 0;
}

td,
th {
    padding: 2px 9px;
}

.container {
    width: 100%;
}

#legend-container,
#legend-container-mobile {
    margin-top: 2rem;
}

p.legend-mobile {
    text-align: center;
    margin-bottom: .8rem;
}

.footer {
    border-top: 1px solid silver;
    color: #888888;
    font-size: 1.25rem;
    text-align: center;
    margin-top: 1rem;
    padding: 0.5rem;
}

#close-details {
    color: #FA5858;
    text-decoration: none;
    font-size: 1.8em;
    text-align: right;
    line-height: 4.5rem;
}

#close-details:hover {
    color: red;
}

#map {
    font-size: 0;
    /* to prevent margin at bottom of map container */
    border: 1px solid rgba(0, 0, 0, .1);
}

g.features {
    stroke: #eee;
}

g.features path:hover {
    opacity: 0.5;
}

h3.state-name {
    text-align: center;
}

h1#map-title {
    text-align: center;
}

ul {
    margin-left: 2em;
}

@media only screen and (max-width: 725px) {
    #legend-container {
        display: none;
    }
    .tooltip {
        display: none;
    }
}

@media only screen and (min-width: 726px) {
    #legend-container-mobile {
        display: none;
    }
}

@media only screen and (max-width: 400px) {
    h1#map-title {
        font-size: 3.3rem;
        text-align: center;
    }
}