See, for example, https://moodle.org/mod/forum/discuss.php?d=223347
The rule
.noticebox, .expired, .notopenyet, .notifysuccess, .notifyproblem, .errorbox, .continuebutton, .singlebutton, .buttons, .singleselect {
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margin: 1em 0;
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text-align: center;
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}
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screws things up. It seems to be necssary to add something like
option, optgroup {
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text-align: left;
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}
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