1

 .mask {
-	position: fixed;
-	/* left: 44%; */
-	top: 32%;
-	left: 50%;
-	transform: translate(-52%, -45%);
-	-webkit-transform: translate(-52%, -45%);
-	-o-transform: translate(-52%, -45%);
-	-moz-transform: translate(-52%, -45%);
-	-ms-transform: translate(-52%, -45%);
-	/* display: none; */
-	/* top: 300px; */
-	padding: 0.24rem 0.32rem;
-	box-sizing: border-box;
-	background: rgba(0, 0, 0, 0.6);
-	border-radius: 0.1rem;
-	font-size: 0.18rem;
-	color: rgba(255, 255, 255, 1);
-	z-index: 1000;
+    position: fixed;
+    /* left: 44%; */
+    top: 32%;
+    left: 50%;
+    transform: translate(-52%, -45%);
+    -webkit-transform: translate(-52%, -45%);
+    -o-transform: translate(-52%, -45%);
+    -moz-transform: translate(-52%, -45%);
+    -ms-transform: translate(-52%, -45%);
+    display: none;
+    /* top: 300px; */
+    padding: 0.24rem 0.32rem;
+    box-sizing: border-box;
+    background: rgba(0, 0, 0, 0.6);
+    border-radius: 0.1rem;
+    font-size: 0.18rem;
+    color: rgba(255, 255, 255, 1);
+    z-index: 1000;
 }
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