.chart {
    height: 400px;
    float: left;
    width: 33%;
}

.chart-half {
    height: 400px;
    float: left;
    width: 50%;
}

.chart-wide {
    height: 400px;
    float: left;
    width: 66%;
}

.chart-fullwidth {
    height: 400px;
    float: left;
    width: 100%;
}