added sidebar icon

src/commons/sidebar.jsx

@@ -1,3 +1,9 @@
 export default function Sidebar() {
-  return <div className="sidebar">Sidebar</div>;
+  return (
+    <div className="sidebar">
+      <button className="nav-btn">
+        <i class="fa fa-bars" />
+      </button>
+    </div>
+  );
 }

src/sass/_base.scss

@@ -34,6 +34,11 @@ body {
   line-height: 1.6;
 }
 
+::selection {
+  background-color: $color-primary;
+  color: #fff;
+}
+
 .container {
   display: grid;
   grid-template-rows: 80vh min-content 40vw repeat(3, min-content);

src/sass/_sidebar.scss

@@ -2,4 +2,15 @@
   background-color: $color-primary;
   grid-column: sidebar-start / sidebar-end;
   grid-row: 1 / -1;
+
+  .nav-btn {
+    border: none;
+    border-radius: 0;
+    background-color: $color-primary;
+    color: $color-grey-dark-2;
+    font-size: 4rem;
+    cursor: pointer;
+    margin: 0 auto;
+    display: block;
+  }
 }