Added tutorial and session mechanism
diff --git a/public/scss/util.scss b/public/scss/util.scss
index 7c3f056..d81b7f9 100644
--- a/public/scss/util.scss
+++ b/public/scss/util.scss
@@ -1,9 +1,23 @@
 /**
+ * Official IDS colors
+ */
+$ids-orange-1: rgb(246, 168,   0);
+$ids-orange-2: rgb(242, 148,   0);
+$ids-grey-1:   rgb(135, 136, 138);
+$ids-grey-2:   rgb(217, 218, 219);
+$ids-blue-1:   rgb(  0, 158, 224); // Pragmatik
+$ids-blue-2:   rgb(188, 228, 247); // Pragmatik
+$ids-green-1:  rgb( 99, 111,   7); // Grammatik
+$ids-green-2:  rgb(227, 232, 163); // Grammatik
+$ids-pink-1:   rgb(193,   0,  43); // Lexik
+$ids-pink-2:   rgb(250, 243, 222); // Lexik
+
+/**
  * Orange Colors
  */
 $light-orange:   #f4eebb; // #ffe56a;
 $middle-orange:  #ffd080;
-$dark-orange:    #ffa500;
+$dark-orange:    $ids-orange-1; // #ffa500;
 $darker-orange:  #ff8000;
 $darkest-orange: darken($dark-orange, 20%);
 // $light-orange-2: #f4eebb;, #ffd080;
@@ -12,9 +26,9 @@
 /**
  * Green Colors
  */
-$dark-green:    #496000;
-$middle-green:  #688704;
-$light-green:   #7ba400;
+$dark-green:    $ids-green-1; // #496000;
+$middle-green:  lighten($ids-green-1, 5%); // $ids-green-1; // #688704;
+$light-green:   lighten($ids-green-1, 10%); // #7ba400;
 
 /**
  * Blue Colors
@@ -27,12 +41,16 @@
 /*
  * Grey
  */
-$light-grey:   #ddd;
+$light-grey:   $ids-grey-2; // #ddd;
 $dark-grey:    #555;
 $middle-grey:  #999;
 // $nearly-white: #f5f5f5;
 $nearly-white: #fff;
 
+$middle-red: #c1002b;
+$light-red: lighten($middle-red, 40%);
+$dark-red: darken($middle-red, 40%);
+
 $dark-shadow: 1px 1px 1px rgba(0,0,0,0.3);
 $light-shadow: 1px 1px rgba(255,255,255,0.5);
 
@@ -47,7 +65,7 @@
 $kwic-match-color:  $dark-grey;
 $kwic-match-shadow: $light-shadow;
 
-$kwic-highlight-1:  #c1002b;
+$kwic-highlight-1:  $middle-red;
 $kwic-highlight-2:  $dark-blue;   // #009ee0;
 $kwic-highlight-3:  $dark-orange; // #f29400;
 $kwic-highlight-4:  $light-green;
@@ -57,7 +75,7 @@
 $choose-border: 2px solid $choose-border-color;
 $choose-color:  $dark-grey;
 $choose-blind-color:  $middle-grey;
-$choose-box-shadow: 2px 2px 2px rgba(0,0,0,0.2);
+$choose-box-shadow: 2px 2px 2px  rgba(0,0,0,0.2);
 $standard-border-radius: 6px;
 
 /**
@@ -71,6 +89,7 @@
  */
 $standard-margin: 30px;
 $right-match-distance: 20px;
+$logo-left-distance: 230px;
 
 @mixin blind {
   position: absolute;
@@ -98,6 +117,13 @@
   border-color: $dark-green;
 }
 
+@mixin choose-remove {
+  color: $nearly-white;
+  text-shadow: none;
+  background-color: $middle-red;
+  border-color: $dark-red;
+}
+
 @mixin color-transition {
   transition: color 0.3s ease 0s;
 }