diff --git a/pages/user/assistance/task_assistance.wxss b/pages/user/assistance/task_assistance.wxss
index eee5ab6..d878741 100644
--- a/pages/user/assistance/task_assistance.wxss
+++ b/pages/user/assistance/task_assistance.wxss
@@ -159,14 +159,20 @@ page {
 }
 
 .closes {
-  margin-top: 20rpx;
+  /* margin-top: 20rpx; */
 }
 
 .canvas {
   position: fixed;
   z-index: 11;
   width: 100%;
-  top: 20rpx;
+  top: 0;
+	bottom: 0;
+	left: 0;
+	right: 0;
+	background-color: rgba(0,0,0,.5);
+	box-sizing: border-box;
+	padding-top: 60rpx;
 }
 
 .close {
@@ -206,15 +212,15 @@ page {
 }
 
 .closes {
-  margin-top: 20rpx;
+  /* margin-top: 20rpx; */
 }
 
-.canvas {
+/* .canvas {
   position: fixed;
   z-index: 20;
   width: 100%;
   top: 20rpx;
-}
+} */
 
 .close {
   width: 70rpx;