body {
    margin: 0;
    padding: 20px;
    background-color: #252525;
}

h1 {
    color: #fff;
    text-align: center;
}

.row {
    display: flex;
    height: 400px;
    margin-bottom: 20px;
}

.chart {
    flex: 1 1 0;
    height: 400px;
}

.chart:nth-child(2) {
    margin-left: 20px;
}

footer {
    color: #fff;
    text-align: center;
}

a {
    color: #fff;
}

@media screen and (max-width: 960px) {
    h1 {
        font-size: 24px;
    }

    .row {
        display: block;
        height: unset;
    }

    .chart:nth-child(2) {
        margin-left: 0;
        margin-top: 20px;
    }
}