Fix line break of social icons on small viewports

Author: aschempp

book/plugin.css

@@ -0,0 +1,12 @@
+@media screen and (max-width: 850px) {
+    body.with-summary .edit-link {
+        overflow: hidden;
+        width: 30px;
+    }
+}
+@media screen and (max-width: 500px) {
+    .edit-link {
+        overflow: hidden;
+        width: 30px;
+    }
+}

index.js

@@ -3,7 +3,8 @@ var path = require('path');
 module.exports = {
     book: {
         assets: "./book",
-        js: ["plugin.js"]
+        js: ["plugin.js"],
+        css: ["plugin.css"]
     },
     hooks: {
         // After html generation