MediaWiki:Common.css

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/* CSS placed here will be applied to all skins */
.donor-grid {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin-top: 50px;
}

.donor-row {
    display: flex;
    justify-content: center;
}

.donor-cell {
    width: 50px;
    height: 50px;
    background-color: #ccc;
    margin: 5px;
    display: inline-block;
}
/* CSS for leaderboard design */
.leaderboard {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.leaderboard-row {
    margin: 5px 0;
}

.leaderboard-image {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    margin-right: 10px;
}
<style>
    .leaderboard {
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
    }

    .row {
        display: flex;
        justify-content: center;
        margin-bottom: 5px;
    }

    .position {
        font-size: 20px;
        margin-right: 10px;
    }

    .avatar img {
        width: 50px;
        height: 50px;
        border-radius: 50%;
        margin: 0 5px;
    }
</style>