diff --git a/main.py b/main.py
index 3033e39..bdb4584 100644
--- a/main.py
+++ b/main.py
@@ -37,8 +37,20 @@ gr.Chatbot.postprocess = format_io
 from theme import adjust_theme
 set_theme = adjust_theme()
 
+CSS = """
+.markdown-body table {
+    border: 1px solid #ddd; 
+    border-collapse: collapse;
+}
+
+.markdown-body th, .markdown-body td {
+    border: 1px solid #ddd; 
+    padding: 5px;
+}
+"""
+
 cancel_handles = []
-with gr.Blocks(theme=set_theme, analytics_enabled=False) as demo:
+with gr.Blocks(theme=set_theme, analytics_enabled=False, css=CSS) as demo:
     gr.HTML(title_html)
     with gr.Row():
         with gr.Column(scale=2):
diff --git a/toolbox.py b/toolbox.py
index b78a513..a7f4f9e 100644
--- a/toolbox.py
+++ b/toolbox.py
@@ -158,11 +158,12 @@ def markdown_convertion(txt):
     """
         将Markdown格式的文本转换为HTML格式。如果包含数学公式，则先将公式转换为HTML格式。
     """
+    pre = '<div class="markdown-body">'
+    suf = '</div>'
     if ('$' in txt) and ('```' not in txt):
-        return markdown.markdown(txt,extensions=['fenced_code','tables']) + '<br><br>' + \
-            markdown.markdown(convert_math(txt, splitParagraphs=False),extensions=['fenced_code','tables'])
+        return pre + markdown.markdown(txt,extensions=['fenced_code','tables']) + '<br><br>' + markdown.markdown(convert_math(txt, splitParagraphs=False),extensions=['fenced_code','tables']) + suf
     else:
-        return markdown.markdown(txt,extensions=['fenced_code','tables'])
+        return pre + markdown.markdown(txt,extensions=['fenced_code','tables']) + suf
 
 
 def format_io(self, y):