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How do I fix large columns?

Check out my vb3 responsive style

I like my style better.

vBulletin 3 is not a responsive style, so there isn't anything you can realistically do make it 'fit' on mobile devices. You would need a new responsive style.

The vB3 style was written in 2003 when nobody was using mobile devices to look at websites.

And what is the difference between an adaptive style and a responsive one? Is it really impossible to add code to make it adaptive?

It would need substantially rewriting. It really isn't that simple.

It would need a completely new style.

If it was that easy, everyone would have done it by now.

There are several responsive styles available from third parties and htese can subsequently be customised in the normal way.

I've dug deeper and can tell you where to look for the problem. This is related to the navbar. I would like to keep the standard style.

As above, the vBulletin 3 style is not a responsive style. It was written some years before viewing websites on mobile devices was even a 'thing'.

You will need to rewrite the style or at least substaintial parts of it parts of it using Responsive Media Queries

You also need to be, for the most part, removing the tables that make up much of the vB3 design and replace them with divs, as tables don't generally work well in responsive designs.

None of this is a trivial task and requires knowledge of CSS, html and vBulletin code.

The alternative is to obtain a third party responsive style and customise that to match the look and feel of your existing style, which would be the easier option in my view. The essence of many styles is the colours and fonts and those are quite easy to change.

I don't like the responsive style of a third party. Since it still needs to be Russified, which is a difficult task.

vBulletin 3 was originally coded 16 years ago when there weren't even such things as % or rem or em units used in styling. It was coded using transitional HTML 4.0 and CSS 2.0, both of which are years deprecated. Most of the "responsive" styles you will find are not responsive styles at all but rather hack attempts at making a fixed width style flex.

Mark's assessment is correct. You will need to write a style from the !DOCTYPE to the closing HTML tag if you want it to function like modern responsive themes. In order to make any existing theme function properly you would have to rewrite it to use HTML 5 and CSS 3 anyway.