Image missing height + no widget working!

Hi!

Thanks for your great theme! I tried and create my personal blog at https://khoi.pro, however it has some issues:

– I activate a widget, but it doesn’t show on frontend.
– An image on single post has a wrong height cause you set max-width, but don’t keep height: auto.

Hope you can check and update a theme soo!

The page I need help with: [log in to see the link]