MediaWiki:Common.css

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.portal-column-left {
    float: left;
    width: 50%;
}
.portal-column-right {
    float: right;
    width: 49%;
}
.portal-column-left-wide {
    float: left;
    width: 60%;
}
.portal-column-right-narrow {
    float: right;
    width: 39%;
}
.portal-column-left-extra-wide {
    float: left;
    width: 70%;
}
.portal-column-right-extra-narrow {
    float: right;
    width: 29%;
}
@media only screen and (max-width: 800px) {
    /* Decouple the columns on narrow screens */
    .portal-column-left,
    .portal-column-right,
    .portal-column-left-wide,
    .portal-column-right-narrow,
    .portal-column-left-extra-wide,
    .portal-column-right-extra-narrow {
        float: inherit;
        width: inherit;
    }
}