MediaWiki:Common.css

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/* CSS placed here will be applied to all skins */
.wiki-infobox {
    float: right;
    margin: 0 0 1em 1em;
    border: 1px solid #aaa;
    background: #f8f8f8;
    padding: 0.5em;
    width: 250px;
}

@media (max-width: 600px) {
    .wiki-infobox {
        float: none;
        width: 100%;
        max-width: 100%;
        margin: 1em auto;
        text-align: center;
    }
}