Added tutorial and session mechanism
diff --git a/public/scss/sidebar.scss b/public/scss/sidebar.scss
new file mode 100644
index 0000000..3920ef5
--- /dev/null
+++ b/public/scss/sidebar.scss
@@ -0,0 +1,135 @@
+@charset "utf-8";
+@import "util";
+
+#sidebar {
+/*
+  box-shadow: 2px 2px 5px darken($dark-green, 15%);
+*/
+//  box-shadow: $choose-box-shadow;
+  outline: none;
+  display: block;
+  background-color: $dark-green;
+  position: fixed;
+  z-index: 7100;
+  color: $nearly-white;
+  width: $logo-left-distance;
+  top: 0;
+  left: 0;
+  height: 100%;
+  padding-top: 80px;
+  transition: all .3s ease-in-out;
+
+  > * {
+    opacity: 1;
+  }
+  &::after {
+    display: block;
+    opacity: 0;
+    cursor: pointer;
+    position: absolute;
+    right: 0;
+    bottom: 0;
+    margin-right: -30px;
+    background-color: $dark-green;
+    content: '#';
+    font-size: 16pt;
+    width: 16pt;  
+    height: 17pt;
+    padding: 6pt;
+    border-top-right-radius: $standard-border-radius;
+  }
+}
+
+#sidebar:not(:focus):not(.active) {
+  margin-left: -1 * ($logo-left-distance - 15px);
+//  box-shadow: none;
+  &::after {
+    opacity: 1;
+  }
+  > * {
+    opacity: 0;
+    // TODO
+    transition: {
+      property: opacity;
+      duration: .3s;
+    }
+  }
+}
+
+/*
+#sidebar {
+  text-shadow: none;
+  height: 105%;
+  margin-top: -10px;
+  background-color: #496000;
+  left: 0;
+  top: 0;
+  &.active {
+    box-shadow: 2px 2px 5px darken($dark-green, 15%);
+    margin-left: 0px;
+    left: 0;
+    top: 0;
+  }
+  &:not(.active) > i.fa-bars {
+    opacity: 1;
+    cursor: pointer;
+    background-color: #496000;
+    position: fixed;
+    font-size: 16pt;
+    width: 16pt;  
+    height: 17pt;
+    padding: 6pt;
+    bottom: 0;
+    left: 0;
+    border-top-right-radius: 5pt;
+  }
+  h2 {
+    font: {
+      size: 100%;
+      weight: bold;
+    }
+    text-align: center;
+    padding: 0;
+    margin: 0 0 5pt 0;
+  }
+  ul {
+    list-style-type: none;
+    margin: 0;
+    font-size: 10pt;
+    text-indent: 0;
+    padding: 0;
+    li {
+      padding: 4pt 10pt;
+      h3 {
+        font: {
+	  weight: bold;
+	  size: 100%;
+	}	  
+	padding: 0;
+	margin: 0;
+      }
+      &.active {
+	background-color: $light-green;
+//	text-shadow: 1px 1px rgba(0, 0, 0, 0.4);
+	text-shadow: none;
+	h3 {
+	  margin-bottom: 2pt;
+	  padding-bottom: 2pt;
+	  border-bottom: 1px solid black;
+	}
+      }
+    }
+  }
+  dl.info {
+    font-size: 9pt;
+    padding: 0 10pt;
+    > dt {
+      font-weight: bold;
+      float: left;
+    }
+    > dd {
+      text-align: right;
+    }
+  }
+}
+*/
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