Spoiler tag customization

Technical Details

Forum version : #phpBB3
Position : Founder
Concerned browser(s) : Google Chrome
Screenshot of problem : https://2img.net/h/s20.postimg.cc/8w7vy2vyl/chrome_2017_02_01_11_01_05.png
Who the problem concerns : All members
Forum link : http://elitetriforce.4umotion.com

Description of problem

Hello there,

Using the Spoiler tag on my forum looks like this:



I want to remove the colon. Where the arrow is pointing.

I have a fair understanding of CSS and how to change it on the admin side, but I can't find the right function.

I greatly appreciate the help.

Thank you very much.

Please excuse me, bumping...!

hello 

read this tutorial 
https://help.forumotion.com/t135638-personalize-the-titles-of-quote-spoiler-and-code?highlight=Personalize