Fix broken github ribbon

Author: snoozer05

_layouts/default.html

@@ -44,6 +44,12 @@ <h1>{{ page.title }}</h1>
     </div>
     {% include analytics_tracker.html %}
     <p id="now_streaming"><a href="/live">NOW STREAMING!!!!</a></p>
-    <a href="https://github.com/ruby-sapporo/ruby-sapporo.org"><img style="position: absolute; top: 0; right: 0; border: 0;" src="https://camo.githubusercontent.com/365986a132ccd6a44c23a9169022c0b5c890c387/68747470733a2f2f73332e616d617a6f6e6177732e636f6d2f6769746875622f726962626f6e732f666f726b6d655f72696768745f7265645f6161303030302e706e67" alt="Fork me on GitHub" data-canonical-src="https://s3.amazonaws.com/github/ribbons/forkme_right_red_aa0000.png"></a>
+    <a href="https://github.com/ruby-sapporo/ruby-sapporo.org" class="github-corner" aria-label="Fork me on GitHub">
+      <svg width="80" height="80" viewBox="0 0 250 250" aria-hidden="true">
+        <path d="M0 0l115 115h15l12 27 108 108V0z"></path>
+        <path class="octo-arm" d="M128.3,109.0 C113.8,99.7 119.0,89.6 119.0,89.6 C122.0,82.7 120.5,78.6 120.5,78.6 C119.2,72.0 123.4,76.3 123.4,76.3 C127.3,80.9 125.5,87.3 125.5,87.3 C122.9,97.6 130.6,101.9 134.4,103.2" fill="currentColor"></path>
+        <path class="octo-body" d="M115.0,115.0 C114.9,115.1 118.7,116.5 119.8,115.4 L133.7,101.6 C136.9,99.2 139.9,98.4 142.2,98.6 C133.8,88.0 127.5,74.4 143.8,58.0 C148.5,53.4 154.0,51.2 159.7,51.0 C160.3,49.4 163.2,43.6 171.4,40.1 C171.4,40.1 176.1,42.5 178.8,56.2 C183.1,58.6 187.2,61.8 190.9,65.4 C194.5,69.0 197.7,73.2 200.1,77.6 C213.8,80.2 216.3,84.9 216.3,84.9 C212.7,93.1 206.9,96.0 205.4,96.6 C205.1,102.4 203.0,107.8 198.3,112.5 C181.9,128.9 168.3,122.5 157.7,114.1 C157.9,116.9 156.7,120.9 152.7,124.9 L141.0,136.5 C139.8,137.7 141.6,141.9 141.8,141.8 Z" fill="currentColor"></path>
+      </svg>
+    </a>
   </body>
 </html>

styles/screen.css

@@ -173,3 +173,52 @@ h1 {
 img {
   border: 0;
 }
+
+/* GitHub ribbon */
+.github-corner {
+  position: absolute;
+  top: 0;
+  right: 0;
+  border: 0;
+  fill: #c01848;
+  color: #fff;
+}
+
+.github-corner svg {
+  display: block;
+}
+
+.github-corner .octo-arm {
+  transform-origin: 130px 106px;
+}
+
+.github-corner .octo-arm,
+.github-corner .octo-body {
+  fill: currentColor;
+}
+
+.github-corner:hover .octo-arm {
+  animation: octocat-wave 560ms ease-in-out;
+}
+
+@keyframes octocat-wave {
+  0%, 100% {
+    transform: rotate(0deg);
+  }
+  20%, 60% {
+    transform: rotate(-25deg);
+  }
+  40%, 80% {
+    transform: rotate(10deg);
+  }
+}
+
+@media (max-width: 500px) {
+  .github-corner:hover .octo-arm {
+    animation: none;
+  }
+
+  .github-corner .octo-arm {
+    animation: octocat-wave 560ms ease-in-out;
+  }
+}