Change colour of border blocks?

[gnrx]

Hello.
I have some blocks in my forum (vbulletin 4.2.5) and the border have the blue colour.
I want to change to blank (for appears transparent the border block) but I search in style vars but not view this option.
Its possible change this?

Thanks and regards.

--------------- Added [DATE]1524148055[/DATE] at [TIME]1524148055[/TIME] ---------------

Solved, is the variable: sidebar_background



--------------- Added [DATE]1524148436[/DATE] at [TIME]1524148436[/TIME] ---------------

Wow, but only change in forum index, when access to subforum, continue with the blue colour, not the new colour set in sidebar_background...

--------------- Added [DATE]1524161746[/DATE] at [TIME]1524161746[/TIME] ---------------

Sorrys, change the colour in all forums, not only in the index, cache I played a dirty trick...xD

Sorrys.

[snakes1100]

You would need to provide more details of which blocks, some blocks for example "member profile blocks" dont have a variable to change, they follow a global variable.

[gnrx]

Thanks snakes1100,
Yes, in the editor variables, I need edit this style var: sidebar_background
I can set background to transparent for sidebar (the blocks at right of forum) but then, I view that, all blocks / sidebars (like My profile) also, appears transparent...jejee. and I only want change this colour in the sidebar (blocks in right of index forum).

Again, thank you!