优化遮罩层

src/static/web/css/admin.css

@@ -339,11 +339,11 @@ body.menu-show .admin-content {
 	display:none
 }
 .fullpagediv {
-	position:absolute;
+	position:fixed;
 	top:0;
 	left:0;
-	width:100%;
-	height:100%;
+	width:100vw;
+	height:100vh;
 	background:#000;
 	opacity:0.5;
 	z-index:1980

src/static/web/js/admin.main.js

@@ -116,7 +116,7 @@ function ChangeFullDiv(showhide, screenheigt) {
 		if (!newobj) {
 			newobj = document.createElement("div");
 			newobj.id = "fullpagediv";
-			newobj.style.position = "absolute";
+			newobj.style.position = "fixed";
 			newobj.className = "fullpagediv";
 			newobj.style.height = document.body.clientHeight + "px";
 			document.body.appendChild(newobj);