hehe/user/plugins/admin/themes/grav/templates/partials/stylesheets.html.twig

{% do assets.addCss(theme_url~'/css-compiled/nucleus.css') %}
{% do assets.addCss(theme_url~'/css-compiled/template.css') %}
{% do assets.addCss(theme_url~'/css-compiled/preset.css') %}
{% if config.plugins.admin.google_fonts %}
    {% do assets.addCss(theme_url~'/css-compiled/fonts.css') %}
{% else %}
    {% do assets.addCss(theme_url~'/css-compiled/simple-fonts.css') %}
{% endif %}
{% do assets.addCss(theme_url~'/css/'~icon_style~'.min.css') %}
{% do assets.addCss(theme_url~'/css/chartist.min.css') %}
{% do assets.addCss(theme_url~'/css/selectize.min.css') %}
{% do assets.addCss(theme_url~'/css/hint.base.min.css') %}
{% do assets.addCss(theme_url~'/css/iconpicker.css') %}
{% if browser.getBrowser == 'msie' and browser.getVersion >= 8 and browser.getVersion <= 9 %}
    {% do assets.addCss(theme_url~'/css/nucleus-ie9.css') %}
    {% do assets.addCss(theme_url~'/css/pure-0.5.0/grids-min.css') %}
{% endif %}