Checkout not quite responsive

Our checkout is not working properly. It doesn't fit to the screen in upright position on mobile screens, only lying position works. On tablets both ways work fine.
Anyone have a solution to this problem?

Using OC 1.5.6.4 and Journal 2 theme + Klarna Checkout payment extension

Are you using Journal Quick checkout? It doesn't always work properly.

Also, since Journal is a paid theme, you may want to contact the devs for support.

No, standard OC checkout. Have posted for support, but Journal developer says to talk to check out developer and same thing the other way around:-(

Well, actually we are using paid checkout Klarna Checkout. But on Journal settings we have desiable the quick checkout

personally, I would just compare the Style Coding of a v.1.5.6.x responsive Theme Checkout File with the default OC v.1.5.6.x Source, to find out, what has to be changed, to PLACE the Stuff by CSS, and not longer (usually) by HTML Table-Arrangements, to make it responsive. But I am not familiar with Journal Themes, so I don't know, wich Road they follow to get the stuff responsive, but I assume, it only takes an assortment of Style Commands, to also make a 'default' Checkout File responsive.

The AGNES 1.5.6.x Theme is responsive, and free, along with two hand full of others. It could serve as reference, in case, you have some knowledge on Stylesheet Stuff and PHP.
Good Luck, just figured...
Ernie