how to remove element { background color in css using browser extension?

Issue

How to remove the element background color using browser extension for a online website? I want to remove this color for add this website in OBS?
I've tried this:

    main-content wf100 {
        background-color: transparent;  
    }


    .main-content .wf100 {
        background: transparent;    
    }

    #main-content .wf100 {
        background: transparent;    
    }

Solution

main-content and wf100 are two classes for the same element. So, the code will be like this--

.main-content.wf100{
   background: transparent; 
}

if this does not work, use this !important flag on CSS value.

Example--

.main-content.wf100{
   background: transparent !important; 
}

Answered By - Nayeem M. Muzahid