add style to session expired

css/src/main.css

@@ -551,6 +551,7 @@ a.button-setup {
 .lh {line-height: 0;}
 .oh {overflow:hidden;}
 .vm {vertical-align: middle;}
+.ma { margin: 0 auto;}
 
 .small {
   font-size: 60%;
@@ -1584,3 +1585,16 @@ a.text-warning:hover {color: #FD7262;}
   width: 100%;
   text-align: center;
 }
+
+/*/////////////////////////////////////////////////*/
+
+.session-expired {
+  background: rgba(32,48,64,0.90);
+  width: 100%;
+  height: 100%;
+  position: absolute;
+  color: #fff;
+  z-index: 999;
+  padding-top: 20%;
+  text-align: center;
+}