I've added a widget element (my account widget) to a page using a shortcode (there is an annoying bug when I use the widget). and of course the element is missing the theme's style. I've found one post about this, and how to resolve it, but I can't seem to understand WHERE do I find the html and css relevant to that element, and where to place them. I would love to understand how it is done.
link to my page (you need to create an account to see it): https://rotemy12.sg-host.com/%d7%94%d7%97%d7%a9%d7%91%d7%95%d7%9f-%d7%a9%d7%9c%d7%99/
link to the explanation I found
Many thanks!