Fix unclickable links with Simone's extension

The "Dyslexia Friendly" Chrome extension creates a ruler on the page
which overlaps the text on some pages like ours so that links cannot be clicked on.
This makes the ruler a bit smaller so links work again.

Reported and can be removed again after this has been fixed:
javoire/dyslexia-friendly#18

source/stylesheets/application.css.scss

@@ -193,3 +193,12 @@ img.profile {
     height: 256px;
   }
 }
+
+/* the "Dyslexia Friendly" Chrome extension creates a ruler on the page
+   which overlaps the text on some pages like ours so that links cannot be clicked on;
+   this makes the ruler a bit smaller so links work again;
+   reported and can be removed again after this has been fixed:
+   https://github.com/javoire/dyslexia-friendly/issues/18 */
+#ruler {
+  max-height: 20px !important;
+}