I have had a bad experience, and I can get the rationale for the presence of a bottom navigation scroll bar inside your forum. I believe that you need to care about it.
The problem is in the <body style.
Inside the element, you use position: absolute; width: 100%;
} that is not positioned properly because it pushes the container out of the layout.
What about positioning with the correct width?
You could use:
position: relative; width: auto;
Love you ArtRage!![]()