修改

@@ -220,10 +220,11 @@ span.back_href {
 	display: flex;
 	display: flex;
 	justify-content: center;
 	justify-content: center;
 	/*position: absolute;*/
 	/*position: absolute;*/
-	bottom: 0;
+	position:fixed;
+	bottom: 0.2rem;
 	left: 0;
 	left: 0;
 	right: 0;
 	right: 0;
-	margin: 0.42rem auto 0.34rem;
+	/*margin: 0.42rem auto 0.34rem;*/
 }
 }
 .bottom_img{
 .bottom_img{
 	width: 0.4rem;
 	width: 0.4rem;