          .mindmap-viewer {
                position: fixed;
                top: 0;
                left: 0;
                right: 0;
                bottom: 0;
                background: white;
                z-index: 1000;
                display: none;
            }

            .viewer-header {
                position: fixed;
                top: 0;
                left: 0;
                right: 0;
                background: white;
                height: 50px;
                box-shadow: 0 1px 3