MediaWiki:Common.css

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/* CSS placed here will be applied to all skins */

/* FORCIBLY HIDE THE APPREARANCE/THEME TOGGLE MENU BUTTON */
#p-appearance, 
.vector-dropdown-content #p-appearance {
    display: none !important;
}

/* FORCIBLY OVERRIDE GREY SKIN LAYERS TO PURE BLACK */
body, 
.mw-page-container, 
.vector-header-container, 
#mw-navigation {
    background-color: #000000 !important;
    --background-color-base: #000000 !important;
    --background-color-neutral-subtle: #000000 !important;
}

/* KEEP MAIN CONTENT CONTAINER CLEAN AND CRISP */
.mw-content-container {
    background-color: #000000 !important;
}