Login background is dark

[Robot]

I saw someone else post a thread but i don't really understand it.

http://community.mybb.com/attachment.php...nail=32220

http://community.mybb.com/thread-157778.html

how would i totally remove the background color? I don't want it to get dark at all i wan't it to stay the same.

    block: function() {
      var initialOpacity = this.options.doFade ? 0 : this.options.opacity;
      this.$elm.trigger($.modal.BEFORE_BLOCK, [this._ctx()]);
      this.blocker = $('<div class="jquery-modal blocker"></div>').css({
        top: 0, right: 0, bottom: 0, left: 0,
        width: "100%", height: "100%",
        position: "fixed",
        zIndex: this.options.zIndex,
        background: this.options.overlay,
        opacity: initialOpacity
      });

and 

this.blocker=e('<div class="jquery-modal blocker"></div>').css({top:0,right:0,bottom:0,left:0,width:"100%",height:"100%",position:"fixed",zIndex:this.options.zIndex,background:this.options.overlay,opacity:t})

I would like to do the css method but i have no clue what to put.