Fixes CSS color rules that look bad in dark mode

Currently like this due to custom css:

app.py

@@ -89,12 +89,10 @@ custom_css = """
 .header h1 {
     font-size: 2.5rem !important;
     font-weight: 700 !important;
-    color: #1a5276 !important;
     margin-bottom: 0.5rem !important;
 }
 .header p {
     font-size: 1.2rem !important;
-    color: #34495e !important;
 }
 .chatbot-container {
     border-radius: 10px !important;
@@ -121,10 +119,8 @@ custom_css = """
     margin-top: 2rem;
     text-align: center;
     font-size: 0.9rem;
-    color: #7f8c8d;
 }
 .parameters-section {
-    background-color: #f8f9fa !important;
     padding: 1rem !important;
     border-radius: 8px !important;
     margin-bottom: 1rem !important;
@@ -138,6 +134,20 @@ custom_css = """
 .right-panel {
     padding-left: 1rem !important;
 }
+@media (prefers-color-scheme: light) {
+    .parameters-section {
+        background-color: #f8f9fa !important;
+    }
+    .footer {
+        color: #7f8c8d;
+    }
+    .header p {
+        color: #34495e !important;
+    }
+    .header h1 {
+        color: #1a5276 !important;
+    }
+}
 """
 
 # Create the Gradio interface with a modern, professional design