Update existing-plugins.md (#2717)

* Update existing-plugins.md

* prettier

* Update plugins.css

docs/plugins/existing-plugins.md

@@ -4,12 +4,15 @@ title: Existing plugins
 description: Lists of existing open source plugins
 ---
 
-## Open source plugins
+## The Plugin Marketplace
 
-The full list of open source plugins can be found
-[here](https://github.com/spotify/backstage/tree/master/plugins).
+Open source plugins that you can add to your Backstage deployment can be found
+at:
 
-## Plugin gallery
+https://backstage.io/plugins
 
-TODO: In the future we would like to have something similar to
-https://grafana.com/grafana/plugins
+![](https://backstage.io/blog/assets/marketplace.png)
+
+## Links
+
+- [[blog] The Plugin Marketplace is open](https://backstage.io/blog/2020/09/30/plugin-marketplace)

microsite/static/css/plugins.css

@@ -53,12 +53,12 @@
 .ButtonFilled {
   padding: 4px 8px;
   border-radius: 4px;
-  color: #69DDC7;
+  color: #69ddc7;
   margin-top: 36px;
 }
 
 .ButtonFilled:hover {
-  border: 1px solid #69DDC7;
+  border: 1px solid #69ddc7;
   background-color: transparent;
 }
 
@@ -66,8 +66,8 @@
   font-size: small;
   border-radius: 16px;
   padding: 2px 8px;
-  border: 1px solid #69DDC7;
-  color: #69DDC7;
+  border: 1px solid #69ddc7;
+  color: #69ddc7;
 }
 
 .PluginCardLink {
@@ -111,5 +111,5 @@
 }
 
 #add-plugin-card {
-  border: 1px solid #69DDC7;
+  border: 1px solid #69ddc7;
 }