nngn: minor changes to main page

bbguimaraes.com/nngn/index.html

@@ -22,10 +22,15 @@
                     <source src="/files/nngn/fiona.webm" />
                     Your browser doesn't support the &lt;video&gt; tag.
                 </video>
+                <video
+                        controls preload="none"
+                        poster="/files/nngn/screenshots/post_poster.png">
+                    <source src="/files/nngn/screenshots/post.webm" />
+                    Your browser doesn't support the &lt;video&gt; tag.
+                </video>
             </div>
             <p>
-<i>nngn</i> is a free and open source 2D/3D graphics/game/physics engine.  Read
-more about it in the <a href="/blog/tags/nngn.html">blog</a> section.
+<i>nngn</i> is a free and open source 2D/3D graphics/game/physics engine.
             </p>
             <ul>
                 <li>
@@ -37,6 +42,9 @@ more about it in the <a href="/blog/tags/nngn.html">blog</a> section.
                     (github)
                 </li>
                 <li><a href="docs/">documentation</a></li>
+                <li>
+                    <a href="/blog/tags/nngn.html">blog posts</a>
+                </li>
                 <li>
                     screenshots/videos
                     <ul>

bbguimaraes.com/nngn/nngn.css

@@ -18,6 +18,12 @@ main {
     display: block;
     margin-left: auto;
     margin-right: auto;
+    width: 100%;
+    max-width: 400px;
+}
+
+.main-video video:not(:first-child) {
+    padding-top: 2em;
 }
 
 .screenshots {