MediaWiki:Minerva.css

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/* All CSS here will be loaded for users of the MinervaNeue skin */
.skin-minerva .minerva-header {
    background-color: red !important;
    margin: 0 !important; /* Remove any margins */
    padding: 0 !important; /* Remove any padding */
    border: none !important; /* Remove any borders */
}

.skin-minerva #mw-mf-viewport {
    background-color: red !important; /* Set the viewport background to red */
}