.otree-body {
        max-width: 1200px;
    }
    .page-header {
        margin-top: 20px;
        margin-bottom: 20px;
        padding-top: 40px;
        text-align: center;
    }
    .otree-btn-next {
        float: right;
        margin-left: 52.5%;
        margin-right: 47.5%;
    }