Changing input text colour when posting

Hi there, I'm really sorry to bother you guys and I tried looking through the search options but nothing seemed to qualify for what I'm looking for. Basically my forum just changed their background colour scheme etc and it all looks good but we want to change the appearance of the post box to comply with the new design. We found out how to do this but the problem is that our current input text colour (the one that appears while we're typing a post) in illegible with the new posting box. 

So is there a way we can change that default input text colour while posting? 

Thanks in advance.

Hello MissyQuill,

For the editor text color try this :

For source code mode add this to your CSS:
Administration Panel > Display > Pictures and colors > Colors > CSS stylesheet

Code:

.sceditor-container textarea{
    color:#fff !important;
}


For WYSIWYG mode create a new script:
Administration Panel > Modules > HTML & JAVASCRIPT > Javascript codes management
Make sure to tick in all the pages

Code:

$(window).load(function () {
              $(".sceditor-container iframe").contents().find("head").append("<style>body,html,code:before,p,table{color:#fff !important;}</style>")
            });