Add global .markdown class.

It changes textareas to be monospaced.

lib/www/client/source/src/App.vue

@@ -26,6 +26,12 @@
 <style lang="stylus">
   @import '../node_modules/typeface-roboto/index.css'
   @import '../node_modules/@mdi/font/css/materialdesignicons.css'
+  
+  .markdown.v-textarea textarea
+    font-family monospace
+    line-height 1.1 !important
+</style>
+
 </style>
 
 <script>