MediaWiki:Common.css

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.vector-header-container {
    min-height: auto !important;
    padding-top: 0 !important;
    padding-bottom: 0 !important;
}

/* Logo size and alignment adjust */
.vector-header-logo, .mw-logo-icon {
    width: 100px !important;     
    height: auto !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    margin: 0 !important;
    padding: 0 !important;
    box-sizing: border-box !important;
}

/* Adjust logo background */
.vector-header-logo a, .mw-logo-icon a {
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    height: 100% !important;
}