numix-gtk-theme/gtk-3.0/scss/apps/_xfce.scss

@import "panel";

/***************
 ! Xfce styles *
****************/

@include exports("xfce") {
    XfceHeading {
        margin: 0;
        padding: 0;
        border: 0;
        background-image: none;
        background-color: $base_color;
        color: $text_color;
    }

    .xfce4-panel {
        @extend %panel;

        font: normal;

        .button { @extend %panelbutton; }

        .menu { -gtk-image-effect: none; }
    }
}