tweak

src/util/graphic.ts

@@ -803,7 +803,7 @@ export function createTextConfig(
     textConfig.insideStroke = opt.autoColor || null;
     // Set default stroke, which is useful when label is over other
     // messy graphics (like lines) in background.
-    textConfig.outsideStroke = 'rgba(255, 255, 255, 0.7)';
+    textConfig.outsideStroke = 'rgba(255, 255, 255, 0.9)';
     // if (!textStyle.fill) {
     //     textConfig.insideFill = 'auto';
     //     textConfig.outsideFill = opt.autoColor || null;