IPython/html/static/notebook/less/notificationwidget.less

.notification_widget {
    color: @navbar-default-link-color;
    padding: 1px 12px;
    margin: 2px 4px;
    z-index: 10;
    border-radius: @border-radius-base;
    background: @notification_widget_bg;
    .pull-right();
    .border-box-sizing();
    .btn();
    .btn-default();
    .btn-xs();

    &.span {
        padding-right:2px;
    }
}

.notification_widget.warning {
    .btn-warning();
}
.notification_widget.success {
    .btn-success();
}
.notification_widget.info {
    .btn-info();
}
.notification_widget.danger {
    .btn-danger();
}