I seems to be not high enough, meaning it will not cover the whole screen. On the bottom of the screen I have about 2-3 cm of the next section already. What is really weird: the image is cut off to allow for the next section to show…
When I open the website on a mobile device, I do not see the center of the image but the left bit. I had assumed that the image will be repositioned instead of just showing the top left corner.
Since there are countless monitor and view sizes you will get this kind of behaviour on different screens.
It seems like you are looking for a FullHD jumbotron setup, so you might want to try this CSS code and padding spacing for the header and just play with the values until you get your perfect display:
Ideally, the above CSS code should be placed in a child’s theme style.css
But you can use a plugin like Simple Custom CSS or place it directly in the default theme’s Dashboard > Appearances > Editor > Style.css, but please keep in mind that this will get erased if you replace/update the theme files in the future.