Hey @parliamentary_trout! At the moment we do not support setting custom styles for elements inside the component container. In the specific case of antd select, I believe you want to apply the background-color style to container > .ant-select-selector which is not possible at the moment. To add custom CSS right now, I’d suggest you to use app hosting.
@tiago Interestingly, the final styling can be achieved by force disabling the bordered attribute. I am not sure if that’s expected behavior or a bug, but it make us to the final state.
Nice! It’s not a bug, but a characteristic of Ant. It does not apply styles to the selector element overriding the container ones when bordered is false, therefore you are able to see the background from the container.