nopaque/app/templates/_base/stylesheets.html.j2

<link href="{{ url_for('static', filename='external/material-design-icons/css/material-icons.css') }}" rel="stylesheet">
{# <link href="{{ url_for('static', filename='external/materialize/css/materialize.min.css') }}" rel="stylesheet"> #}
{% assets
  filters='pyscss',
  output='gen/nopaque-materialize.%(version)s.css',
  'nopaque-materialize.scss'
-%}
<link href="{{ ASSET_URL }}" rel="stylesheet">
{% endassets -%}
{% if current_user.is_authenticated -%}
{% assets
  filters='pyscss',
  output='gen/sidenav-fixed.%(version)s.css',
  'sass/sidenav-fixed.scss'
-%}
<link href="{{ ASSET_URL }}" rel="stylesheet">
{% endassets -%}
{% endif -%}
<link href="{{ url_for('static', filename='nopaque-icons/css/nopaque-icons.css') }}" rel="stylesheet">
{% assets
  filters='pyscss',
  output='gen/nopaque.%(version)s.css',
  'sass/main.scss'
-%}
<link href="{{ ASSET_URL }}" rel="stylesheet">
{% endassets -%}