palette/views/graphql/graphiql.mustache

<%#
    THIS MIGHT BE A DUMB WAY TO DO THIS

    There's a graphiql gem that runs graphiql in a rails engine, but i think
    it only works with the standard rails asset pipeline.
%>
<% content_for :head do %>
  <style>
    html, body, #graphiql { height: 100% }
    body { margin: 0 }
  </style>
<% end %>
<div id="graphiql"></div>
<%= js_bundle :graphiql %>