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styles.py

@@ -51,6 +51,15 @@ CSS = """
 
 /* ---------- ground ---------- */
 
+/* The platform paints the page behind the app. Without this the margins
+   outside the container stay flat black while the container carries the
+   gradient, leaving a visible seam down both edges. */
+body,
+gradio-app,
+.gradio-container > .main {
+  background: var(--void) !important;
+}
+
 .gradio-container {
   max-width: 1520px !important;
   margin: 0 auto !important;