diff --git a/slides.pdf b/slides.pdf
index 4a9a9de..a73f794 100644
Binary files a/slides.pdf and b/slides.pdf differ
diff --git a/theme/beamerinnerthemeOUCSlide.sty b/theme/beamerinnerthemeOUCSlide.sty
index cce1da0..b9d3369 100644
--- a/theme/beamerinnerthemeOUCSlide.sty
+++ b/theme/beamerinnerthemeOUCSlide.sty
@@ -98,7 +98,7 @@
 %列表框
 \newtcolorbox{vcolorbox}[2][]
 {
-    boxrule=0.1pt,%边框，很细
+    boxrule=0.5pt,%边框，很细
     arc=0pt,outer arc=0pt,%不要圆角
     left=5pt, right=5pt, top=0pt, bottom=0pt,
     leftrule=5pt, %左侧边框的宽度