Fixed z-index definitions to avoid hiding of tree menus

Change-Id: I71044f36ac9c195341dd38735cd8a4c45ee09a36
diff --git a/dev/scss/header/datepicker.scss b/dev/scss/header/datepicker.scss
index 5386d3c..faf8336 100644
--- a/dev/scss/header/datepicker.scss
+++ b/dev/scss/header/datepicker.scss
@@ -12,7 +12,7 @@
 div.datepicker {
   display: inline-block;
   position: absolute;
-  z-index: 8000;
+  z-index: 90;
 
   font-size: 80%;
   padding: 4pt;
diff --git a/dev/scss/header/hint.scss b/dev/scss/header/hint.scss
index d5c6a4a..b2e9bee 100644
--- a/dev/scss/header/hint.scss
+++ b/dev/scss/header/hint.scss
@@ -60,7 +60,7 @@
   position: absolute;
   left: 0;
   top: 0;
-  z-index: 900;
+  z-index: 90;
   white-space: pre-wrap;
   height: 0;
   display: block;
diff --git a/dev/scss/header/menu.scss b/dev/scss/header/menu.scss
index 2696163..8841de5 100644
--- a/dev/scss/header/menu.scss
+++ b/dev/scss/header/menu.scss
@@ -13,7 +13,7 @@
   font-weight: normal;
   // Pagination border?
 
-  z-index: 7000;
+  z-index: 120;
 }
 
 ul.menu > li,
@@ -87,7 +87,7 @@
       display: block;
       right: 0;
       width: 10px;
-      z-index: 600;
+      z-index: 115;
       border: {
 	radius: 4px;
 	width: 2px;
@@ -225,14 +225,14 @@
  */
 span.menu.select {
   > span {
-    z-index: 100;
+    z-index: 105;
   }
   > ul.menu.roll {
     display: none;
     z-index: -100;
     &.visible {
       display: block;
-      z-index: 200;
+      z-index: 110;
     }
   }
 }