How to add colored borders to the main forum area?

[Hatshepsut]

Hello,

I have two SMF forums - the old is 2.0.19, the new is 2.1.2
I like the theme style of the old forum, with its colored left (blue) and right (red) borders of the main area:

https://www.forum.bg-nacionalisti.org/index.php

I would add such style to the new forum, but I don't know how 

[Skhilled]

It is made with images. Press F12 on your keyboard to bring up the web developer. Click the "Pick an element" icon and you can see it is an image.

[Hatshepsut]

It is made with images. Press F12 on your keyboard to bring up the web developer. Click the "Pick an element" icon and you can see it is an image.

Yes, I found related image, called frame_repeat.png

That's appropriate code in the CSS file:

Code Select Expand

/* the content section */
#content_section
{
    background: url(../images/_Stroke/theme/frame_repeat.png) repeat-y top left;
    padding-left: 20px;
}
#content_section div.frame
{
    background: url(../images/_Stroke/theme/frame_repeat.png) repeat-y top right;
    display: block;
    padding: 0 30px 20px 10px;
}

[Skhilled]

You could either alter that one or make/have one created for you according to your needs and use it.

EDIT: I would check to see if that one is copyrighted before using it, etc.