Fixed issue when deleting cards on retina display

frontend/delta/css/clipperz.css

@@ -1283,7 +1283,8 @@ div.dialogBox {
     z-index: 10;
     background-color: rgba(0, 0, 0, 0.5); }
   div.dialogBox .mask {
-    z-index: 25; }
+    z-index: 25;
+    -webkit-transform: translate3d(0, 0, 0); }
   div.dialogBox div.dialog {
     -webkit-box-flex: none;
     -webkit-flex: none;

frontend/delta/scss/core/layout.scss

@@ -599,7 +599,9 @@ div.dialogBox {
 
 	.mask {
 		z-index: 25;
+		@include chromeFix();
 	}
+
 	div.dialog {
 		@include flex(none);
 		z-index: 99999;