added some comments in app.component.html and css

src/app/app.component.css

@@ -1,3 +1,4 @@
+/* size and position of the sidebar */
 .sidebar {
   width: 150px;
   position: relative;
@@ -11,10 +12,12 @@
     font-size: 1em;
 }
 
+/* show curso position on link */
 .nav a:hover:not(.active) {
     font-size: 1.15em;
   }
 
+/* show content beneath sidebar */
 .content {
     position: relative;
     float: right;

src/app/app.component.html

@@ -1,11 +1,13 @@
 <div class="container-fluid">
 
+  <!-- sidebar div -->
   <div class="sidebar">
     <div class="logo">
       <a class="simple-text logo-normal">
         Taskboard
       </a>
     </div>
+    <!-- linklist -->
     <ul class="nav">
       <li class="active ">
         <a href="/dashboard">
@@ -32,6 +34,7 @@
 
   <router-outlet></router-outlet>
 
+  <!-- content class for sidebar-css -->
   <div class="content">
     <div class=" fixed-plugin">
       <div class=" show-dropdown" ngbDropdown>