MediaWiki:Common.css

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/* Style for the logo */
.mw-logo-icon {
    background-color: white; /* Set background to white */
    width: 100px; /* Set width to your desired size */
    height: 100px; /* Set height to the same value as width */
    border-radius: 50%; /* Make it a circle */
    display: flex; /* Center content if needed */
    align-items: center; /* Center content vertically */
    justify-content: center; /* Center content horizontally */
}

/*.mw-logo-icon {
	background-image: url("/logo.png") !important;
}
*/