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I was able to change the background of textarea to gray using Javascript and external css but not the panel/toolbar area. The toolbar area still remain white and this is not good for what I need it for any help.
I had used a Javascript function with this
editor.getBody().style.backgroundColor = "#F5f5f5";
And css selector with this
.mce-content-body {
background: #F5f5f5 ;
}
/* toolbar */
.mce-toolbar-grp {
background-color: #F5f5f5 !important; /* uses !important or override .mce-panel background-color/image */
background-image: none !important;
}