MediaWiki:Mobile.css

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/* Hide the text site name */
.branding-box a span {
    display: none !important;
}

/* Inject logo as pseudo-element */
.branding-box a::before {
    content: url('/images/niewulis-wiki-logo.svg');
    display: block;
    width: 2rem;
    height: 2rem;
}

/* Sidebar logo above nav links */
.menu #p-navigation::before {
    content: url('/images/niewulis-wiki-logo.svg');
    display: block;
    width: 4rem;
    height: 4rem;
    margin: 1rem auto;
}