Update app.py

app.py

@@ -77,12 +77,12 @@ COUNTER = """
         }
         .circle-bg {
             fill: none;
-            stroke: rgba(255, 255, 255, 0.3);
+            stroke: rgba(0, 0, 0, 0.3);
             stroke-width: 6;
         }
         .circle-progress {
             fill: none;
-            stroke: white;
+            stroke: black;
             stroke-width: 6;
             stroke-linecap: round;
             stroke-dasharray: 283;