diff --git a/src/main/webapp/kccadrPb/tutorial/css/tutorial.css b/src/main/webapp/kccadrPb/tutorial/css/tutorial.css
index f7d3c6e4..dfb3b8d3 100644
--- a/src/main/webapp/kccadrPb/tutorial/css/tutorial.css
+++ b/src/main/webapp/kccadrPb/tutorial/css/tutorial.css
@@ -1,4 +1,8 @@
 body{position: relative; width: 100%; height: 100%;}
 .tutorial{width: 100%; height: 100%; overflow-x: hidden;}
-.mask{position: absolute; display: flex; width: 100%; height: 100%; left: 0; top: 0;}
-.left_mask,.right_mask{width: 50%; height: 100%; background-color: transparent;}
\ No newline at end of file
+.tutorial img{position: absolute;left: 50%;top: 0;transform: translateX(-50%);}
+.mask{position: fixed; display: flex; width: 100%; height: 100%; left: 0; top: 0; z-index: 5;}
+.left_mask,.right_mask{width: 50%; height: 100%; background-color: transparent;}
+@media all and (max-width: 1800px){
+	.tutorial img{width: 100%; min-width: 1680px;}
+}
\ No newline at end of file