Update app.py

Change color to hex white

app.py

@@ -26,7 +26,7 @@ h1 {
 }
 .markdown-block {
     background-color: #0b0f1a; /* Light gray background */
-    color: black;   /* Black text */ 
+    color: #ffffff;   /* white text */ 
     padding: 10px;            /* Padding around the text */
     border-radius: 5px;       /* Rounded corners */
     box-shadow: 0 0 10px rgba(11,15,26,1);