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app.py

@@ -208,12 +208,18 @@ def _build_gradio_app():
     grayscale_css = """
     .gradio-container { background: #ffffff; color: #000000; }
     .gallery img, .grid-wrap img { filter: grayscale(100%); background: #000000; }
+    button.primary, .primary button, #convert-btn, #convert-btn button {
+        background: #000000 !important;
+        background-image: none !important;
+        color: #ffffff !important;
+        border-color: #000000 !important;
+    }
     """
 
     with gr.Blocks(title="CZI to PNG Converter", css=grayscale_css) as demo:
         gr.Markdown("# CZI to PNG Converter\nUpload a `.czi` file to get a ZIP of black-and-white PNGs (one per channel/Z plane), with absolute pixel intensities preserved.")
         inp = gr.File(label="CZI file", file_types=[".czi"])
-        btn = gr.Button("Convert", variant="primary")
+        btn = gr.Button("Convert", variant="primary", elem_id="convert-btn")
         out_msg = gr.Textbox(label="Status")
         out_gallery = gr.Gallery(label="Preview (black & white)", columns=4, height="auto")
         out_file = gr.File(label="Download PNGs (ZIP)")

czi_to_png.py

@@ -208,12 +208,18 @@ def _build_gradio_app():
     grayscale_css = """
     .gradio-container { background: #ffffff; color: #000000; }
     .gallery img, .grid-wrap img { filter: grayscale(100%); background: #000000; }
+    button.primary, .primary button, #convert-btn, #convert-btn button {
+        background: #000000 !important;
+        background-image: none !important;
+        color: #ffffff !important;
+        border-color: #000000 !important;
+    }
     """
 
     with gr.Blocks(title="CZI to PNG Converter", css=grayscale_css) as demo:
         gr.Markdown("# CZI to PNG Converter\nUpload a `.czi` file to get a ZIP of black-and-white PNGs (one per channel/Z plane), with absolute pixel intensities preserved.")
         inp = gr.File(label="CZI file", file_types=[".czi"])
-        btn = gr.Button("Convert", variant="primary")
+        btn = gr.Button("Convert", variant="primary", elem_id="convert-btn")
         out_msg = gr.Textbox(label="Status")
         out_gallery = gr.Gallery(label="Preview (black & white)", columns=4, height="auto")
         out_file = gr.File(label="Download PNGs (ZIP)")