MediaWiki:Minerva.css

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/* All CSS here will be loaded for users of the MinervaNeue skin */
/* Make the entire header area red */
.skin-minerva {
    background-color: red !important; /* Set the main background */
}

.skin-minerva .minerva-header {
    background-color: red !important; /* Set the header background */
    margin: 0 !important;
    padding: 0 !important;
}