.redactor-toolbar {
   background: #000 !important;
}

.redactor-toolbar li a {
   color: #fff !important;
}

.redactor-toolbar li a:hover {
   color: #fff !important;
}

.redactor-toolbar li a:active,
.redactor-toolbar li a.redactor-act {
   background: #000 !important;
   color: #aaa !important;
}