Update css font stack

css-system-font-stack.md

@@ -3,6 +3,6 @@ title: "CSS: System font stack"
 category: CSS
 ---
 
-```
-font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
-```
+> font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
+
+Reference: <https://medium.com/design/system-shock-6b1dc6d6596f>

docker-compose.md

@@ -0,0 +1,23 @@
+---
+title: docker-compose
+category: Devops
+---
+
+```yaml
+# docker-compose.yml
+version: '2'
+
+services:
+  web:
+    build: .
+    ports:
+     - "5000:5000"
+    volumes:
+     - .:/code
+  redis:
+    image: redis
+```
+
+```sh
+docker-compose up
+```

ets.md

@@ -36,3 +36,4 @@ iex> table = :ets.new(:my_table, [:set, :protected])
 ## References
 
 * <http://erlang.org/doc/man/ets.html>
+* <http://learnyousomeerlang.com/ets>