Please, check the attachment. The thickness of top header is different. How can I make it thinner? it becomes thinner when I install demo data.
Attached files: Снимок экрана 2017-07-28 в 11.59.01.png
There must be something wrong with the content of your Text widget. Do you use some shortcode there? If not, can you provide admin access to your website so I can have a look what's went wrong?
But possibly just removing that Text widget and adding a new one will resolve the issue.
Oliver JuhasWebMan Design
Yes, re-entering the widget area helped.Thank you!