For greater accessibility please make sure all popup buttons and elements have sufficient color contrast by default, https://webaim.org/resources/contrastchecker/. There's a hidden 'share' button that doesn't meet WCAG AA contrast criteria and I was getting an error in my site until I correct it via styles (see below).

.eapps-widget-toolbar-panel-share-button {background-color: #0c7bc0 !important;}

Thank you for your assistance!