added navbar and global css

css/global.css

@@ -0,0 +1,33 @@
+ul {
+  list-style-type: none;
+  margin: 0;
+  padding: 0;
+  overflow: hidden;
+  background-color: #333;
+}
+
+li {
+  float: left;
+}
+
+li a {
+  display: block;
+  color: white;
+  text-align: center;
+  padding: 14px 16px;
+  text-decoration: none;
+}
+
+li a:hover {
+  background-color: #111;
+}
+
+a {
+    text-decoration: none;
+}
+a:link, a:visited {
+    color: green;
+}
+a:hover {
+    color: red;
+}

css/posts.css

@@ -56,16 +56,6 @@ button {
   font-family: 'system-ui';
 }
 
-a {
-    text-decoration: none;
-}
-a:link, a:visited {
-    color: green;
-}
-a:hover {
-    color: red;
-}
-
 .post,.self {
   width: 50%;
   margin-left: 25%;