why my ReactGantt backgroundcolor is black?

import ReactGantt from 'gantt-for-react';

 <ReactGantt tasks={this.state.tasks}
                        viewMode={this.state.viewMode}
                        customPopupHtml={this.customPopupHtml}
                        scrollOffsets={this.state.scrollOffsets}

                        style={{backgroundColor:'none'}}
            />