diff --git a/app/app.view.css.ts b/app/app.view.css.ts
index aae3669..2f1fdf1 100644
--- a/app/app.view.css.ts
+++ b/app/app.view.css.ts
@@ -9,6 +9,9 @@ namespace $.$$ {
 				direction: 'column',
 			},
 			height: '100%',
+			background: {
+				color: 'white',
+			},
 		},
 
 		Start_page: {
diff --git a/plot/matrix/matrix.view.ts b/plot/matrix/matrix.view.ts
index 55a7637..e32a9a0 100644
--- a/plot/matrix/matrix.view.ts
+++ b/plot/matrix/matrix.view.ts
@@ -281,7 +281,7 @@ namespace $.$$ {
 			svg.attr('width', this.size() + this.axis_width())
 				.attr('height', this.size() + this.axis_width())
 				// .style('font-size', this.range().bandwidth()) // for new d3 version
-				.style('font-size', this.range().rangeBand())
+				.style('font-size', this.range().rangeBand() + 'px')
 				.style('letter-spacing', '1px')
 			
 			const group = svg[ svg.select('g').empty() ? 'append' : 'select' ]('g')