mstdn-fixed-width-for-advanced-ui.css

/* six-columns */
@media (min-width: 2561px) {
    .columns-area > div {
        width: 16.667%;
        max-width: 16.667%;
    }
}

/* five-columns */
@media (min-width: 1921px) and (max-width: 2560px) {
    .columns-area > div {
        width: 20%;
        max-width: 20%;
    }
}

/* four-columns */
@media (min-width: 1367px) and (max-width: 1920px) {
    .columns-area > div {
        width: 25%;
        max-width: 25%;
    }
}

/* three-columns */
@media (min-width: 900px) and (max-width: 1366px) {
    .columns-area > div {
        width: 33.333%;
        max-width: 33.333%;
    }
}

/* two-columns */
@media (min-width: 640px) and (max-width: 900px) {
    .columns-area > div {
        width: 50%;
        max-width: 50%;
    }
}

/* single-column */
@media {
    .columns-area > div > .column,
    .columns-area > div > .mastodon-column-container > .column {
        width: 100%;
    }
}