Add and style the nav bar.

assets/css/styles.css

@@ -30,3 +30,30 @@ figcaption {
 h2 {
   border-bottom: 1px solid #000;
 }
+
+header {
+  display: flex;
+  align-items: center;
+}
+
+header a {
+  text-decoration: none;
+  color: black;
+}
+
+header * {
+  display: inline;
+}
+
+nav {
+  margin-left: auto;
+}
+
+nav li {
+  padding: 20px;
+  border-radius: 5px;
+}
+
+nav li:hover {
+  background-color: #eee;
+}