Update core.css

Author: melloware

themes/base/core.css

@@ -15,15 +15,8 @@
 	display: none;
 }
 .ui-helper-hidden-accessible {
-	border: 0;
-	padding: 0;
-	margin: 0;
-	position: absolute !important;
-	height: 1px;
-	width: 1px;
-	overflow: hidden;
-	clip: rect(1px, 1px, 1px, 1px);
-	clip-path: inset(50%);
+	pointer-events: none;
+        opacity: 0;
 	white-space: nowrap;
 }
 .ui-helper-reset {