minor fixes

modules/ui_javascript.py

@@ -58,6 +58,8 @@ def html_css(is_builtin: bool):
         head += stylesheet(cssfile)
 
     theme_name = modules.shared.cmd_opts.theme or modules.shared.opts.gradio_theme or ''
+    if theme_name == 'default':
+        theme_name = 'black-teal'
     if theme_name.startswith('modern/'):
         theme_name = theme_name[7:]
         theme_folder = next((e.path for e in modules.extensions.extensions if e.name == 'sdnext-ui-ux'), None)