Hello,

01. Browser resizing is not a standard way of checking the concern for the responsive viewports. You can check your Site on a real time device (Mobile/desktop/tablet) and check the issue. After resizing from the desktop viewport to the tablet or mobile screen sizes, the page needs to be reloaded.

02. Navigate to layouts > Edit single product layout > Edit the Container > and in the Xtemos layout choose the Stretch Container.
https://ibb.co/s1DYvJ4

03. Try to use the image or svg widget for the icon in the layout.

Best Regards