Fix colour of links

src/streamlit_app.py

@@ -110,8 +110,8 @@ def main():
         display: inline-block;
         padding: 12px 24px;
         background: linear-gradient(135deg, #17a2b8 0%, #138496 100%);
-        color: white;
-        text-decoration: none;
+        color: white !important;
+        text-decoration: none !important;
         border-radius: 25px;
         font-weight: 600;
         font-size: 0.95rem;
@@ -123,15 +123,33 @@ def main():
     .header-btn:hover {
         transform: translateY(-2px);
         box-shadow: 0 6px 20px rgba(23, 162, 184, 0.4);
-        color: white;
-        text-decoration: none;
+        color: white !important;
+        text-decoration: none !important;
+    }
+    .header-btn:visited {
+        color: white !important;
+        text-decoration: none !important;
+    }
+    .header-btn:link {
+        color: white !important;
+        text-decoration: none !important;
     }
     .header-btn.secondary {
         background: linear-gradient(135deg, #fd7e14 0%, #e55b13 100%);
         box-shadow: 0 4px 15px rgba(253, 126, 20, 0.3);
+        color: white !important;
     }
     .header-btn.secondary:hover {
         box-shadow: 0 6px 20px rgba(253, 126, 20, 0.4);
+        color: white !important;
+    }
+    .header-btn.secondary:visited {
+        color: white !important;
+        text-decoration: none !important;
+    }
+    .header-btn.secondary:link {
+        color: white !important;
+        text-decoration: none !important;
     }
     .header-btn .emoji {
         margin-right: 8px;