Hello Wira,
Thank you for your question about adjusting the position of widgets. This depends on the widget you want to move. Each widget is housed in its own sort of container within another container. So you may be editing the correct widget container but eventually getting constrained by the bigger container.
In your browser, you can right-click on the widget you want to move and “Inspect” it. In the Chrome browser this option is called “Inspect” and in the Firefox browser the same option is called “Inspect element.” In the Safari browser on a Mac you would need to enable the developer tools to get this option.
The above is helpful if you want to edit the right CSS element. I recommend you do so with the custom CSS editor within the Customizer.
But if you let me know which widget you want to move and which theme you are using, we might be able to find a way of moving it without CSS editing.
Best,
Christopher M.