Update javascript/app.js

javascript/app.js

@@ -376,7 +376,7 @@ customElements.define('midi-visualizer', MidiVisualizer);
     divProgress.style.borderRadius = '8px';
     const divInner = document.createElement('div');
     divInner.className = 'progress';
-    divInner.style.color = 'white';
+    divInner.style.color = 'black';
     divInner.style.background = '#0060df';
     divInner.style.textAlign = 'right';
     divInner.style.fontWeight = 'bold';