These files had UTF8 BOM, but i cleaned them:

/opt/cms/sites/staging/at-a-glance/bower_components/paper-fab/demo2.html
/opt/cms/sites/staging/at-a-glance/bower_components/paper-fab/demo.html
/opt/cms/sites/staging/at-a-glance/bower_components/marked-element/demo.html
/opt/cms/sites/staging/at-a-glance/bower_components/marked-element/marked-import.html
/opt/cms/sites/staging/at-a-glance/bower_components/paper-shadow/demo.html
/opt/cms/sites/staging/at-a-glance/bower_components/core-shared-lib/demo.html
/opt/cms/sites/staging/at-a-glance/bower_components/core-drag-drop/demo.html
/opt/cms/sites/staging/at-a-glance/bower_components/core-menu-button/metadata.html
/opt/cms/sites/staging/at-a-glance/bower_components/paper-button/demo2.html
/opt/cms/sites/staging/at-a-glance/bower_components/paper-button/demo.html
/opt/cms/sites/staging/at-a-glance/bower_components/core-layout-trbl/demo.html
/opt/cms/sites/staging/at-a-glance/bower_components/polymer-test-tools/tools.html
/opt/cms/sites/staging/at-a-glance/bower_components/core-tests/runner.html
/opt/cms/sites/staging/at-a-glance/bower_components/highlightjs/styles/ascetic.css
/opt/cms/sites/staging/at-a-glance/bower_components/highlightjs/styles/dark.css
/opt/cms/sites/staging/at-a-glance/bower_components/highlightjs/styles/magula.css
/opt/cms/sites/staging/at-a-glance/bower_components/paper-menu-button/metadata.html
/opt/cms/sites/staging/at-a-glance/bower_components/core-signals/demo.html
/opt/cms/sites/staging/at-a-glance/bower_components/core-layout-grid/metadata.html
/opt/cms/sites/staging/at-a-glance/bower_components/core-field/demo.html
/opt/cms/sites/staging/at-a-glance/bower_components/core-pages/demo.html
/opt/cms/sites/staging/at-a-glance/bower_components/core-pages/metadata.html