Add old platform coop free software presentation

platform-coop-free-software/stack.v0.css

@@ -0,0 +1,55 @@
+body {
+  background: #929292;
+  font-family: "Helvetica Neue";
+  margin: auto;
+  width: 1280px;
+}
+
+a {
+  color: #6baed6;
+}
+
+a:not(:hover) {
+  text-decoration: none;
+}
+
+.stack {
+  background: #222 url(cartographer.png);
+  color: #fff;
+  box-sizing: border-box;
+  -moz-box-sizing: border-box;
+  -webkit-box-sizing: border-box;
+  -ms-box-sizing: border-box;
+  -o-box-sizing: border-box;
+  display: none;
+  font-size: 48px;
+  height: 800px;
+  padding: 160px 80px;
+  width: 1280px;
+  -webkit-transform: translate3d(0,0,0);
+}
+
+.active {
+  box-shadow: 0px 4px 8px rgba(0,0,0,.5);
+  display: block;
+  position: fixed;
+}
+
+.grey {
+  color: #969696;
+}
+
+@media
+screen and (max-device-width: 1024px) {
+  body {
+    width: 1200px;
+  }
+
+  .stack {
+    margin: 40px 0;
+  }
+
+  .stack {
+    display: block;
+  }
+}