wikimedia/mediawiki-extensions-UniversalLanguageSelector

.uls-setlang-dialog {
    h4 {
        margin-bottom: 1em;
        margin-top: 0;
        text-align: center;
    }

    p {
        line-height: 1.6;
    }

    .language-setlang-buttons {
        text-align: right;
        margin-top: 20px;

        @media screen and ( max-width: 599px ) {
            text-align: center;
        }
    }

    .language-setlang-buttons button {
        margin-left: 16px;
    }
}